[U-Boot] [PATCH 01/14] Add proper SPD definitions for DDR1/2/3

Kumar Gala galak at kernel.crashing.org
Tue Aug 12 18:06:09 CEST 2008


From: James Yang <James.Yang at freescale.com>

Also added a few helper functions for DDR1 & DDR2 to print SPD info and
verify the checksum.

Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
---
 common/Makefile   |    1 +
 common/ddr_spd.c  |  498 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/ddr_spd.h |  249 ++++++++++++++++++++++++++
 3 files changed, 748 insertions(+), 0 deletions(-)
 create mode 100644 common/ddr_spd.c
 create mode 100644 include/ddr_spd.h

diff --git a/common/Makefile b/common/Makefile
index 4287108..3ea4abf 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -144,6 +144,7 @@ COBJS-y += cmd_mac.o
 COBJS-$(CONFIG_CMD_MFSL) += cmd_mfsl.o
 COBJS-$(CONFIG_MP) += cmd_mp.o
 COBJS-$(CONFIG_CMD_SF) += cmd_sf.o
+COBJS-$(CONFIG_DDR_SPD) += ddr_spd.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/common/ddr_spd.c b/common/ddr_spd.c
new file mode 100644
index 0000000..e4be34f
--- /dev/null
+++ b/common/ddr_spd.c
@@ -0,0 +1,498 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <ddr_spd.h>
+
+void
+ddr1_spd_dump(const ddr1_spd_eeprom_t *spd)
+{
+	unsigned int i;
+
+	printf("%-3d    : %02x %s\n",
+	       0, spd->info_size,
+	       " spd->info_size,   *  0 # bytes written into serial memory *");
+	printf("%-3d    : %02x %s\n",
+	       1, spd->chip_size,
+	       " spd->chip_size,   *  1 Total # bytes of SPD memory device *");
+	printf("%-3d    : %02x %s\n",
+	       2, spd->mem_type,
+	       " spd->mem_type,    *  2 Fundamental memory type *");
+	printf("%-3d    : %02x %s\n",
+	       3, spd->nrow_addr,
+	       " spd->nrow_addr,   *  3 # of Row Addresses on this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       4, spd->ncol_addr,
+	       " spd->ncol_addr,   *  4 # of Column Addrs on this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       5, spd->nrows,
+	       " spd->nrows        *  5 # of DIMM Banks *");
+	printf("%-3d    : %02x %s\n",
+	       6, spd->dataw_lsb,
+	       " spd->dataw_lsb,   *  6 Data Width lsb of this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       7, spd->dataw_msb,
+	       " spd->dataw_msb,   *  7 Data Width msb of this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       8, spd->voltage,
+	       " spd->voltage,     *  8 Voltage intf std of this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       9, spd->clk_cycle,
+	       " spd->clk_cycle,   *  9 SDRAM Cycle time at CL=X *");
+	printf("%-3d    : %02x %s\n",
+	       10, spd->clk_access,
+	       " spd->clk_access,  * 10 SDRAM Access from Clock at CL=X *");
+	printf("%-3d    : %02x %s\n",
+	       11, spd->config,
+	       " spd->config,      * 11 DIMM Configuration type *");
+	printf("%-3d    : %02x %s\n",
+	       12, spd->refresh,
+	       " spd->refresh,     * 12 Refresh Rate/Type *");
+	printf("%-3d    : %02x %s\n",
+	       13, spd->primw,
+	       " spd->primw,       * 13 Primary SDRAM Width *");
+	printf("%-3d    : %02x %s\n",
+	       14, spd->ecw,
+	       " spd->ecw,         * 14 Error Checking SDRAM width *");
+	printf("%-3d    : %02x %s\n",
+	       15, spd->min_delay,
+	       " spd->min_delay,   * 15 Back to Back Random Access *");
+	printf("%-3d    : %02x %s\n",
+	       16, spd->burstl,
+	       " spd->burstl,      * 16 Burst Lengths Supported *");
+	printf("%-3d    : %02x %s\n",
+	       17, spd->nbanks,
+	       " spd->nbanks,      * 17 # of Banks on Each SDRAM Device *");
+	printf("%-3d    : %02x %s\n",
+	       18, spd->cas_lat,
+	       " spd->cas_lat,     * 18 CAS# Latencies Supported *");
+	printf("%-3d    : %02x %s\n",
+	       19, spd->cs_lat,
+	       " spd->cs_lat,      * 19 Chip Select Latency *");
+	printf("%-3d    : %02x %s\n",
+	       20, spd->write_lat,
+	       " spd->write_lat,   * 20 Write Latency/Recovery *");
+	printf("%-3d    : %02x %s\n",
+	       21, spd->mod_attr,
+	       " spd->mod_attr,    * 21 SDRAM Module Attributes *");
+	printf("%-3d    : %02x %s\n",
+	       22, spd->dev_attr,
+	       " spd->dev_attr,    * 22 SDRAM Device Attributes *");
+	printf("%-3d    : %02x %s\n",
+	       23, spd->clk_cycle2,
+	       " spd->clk_cycle2,  * 23 Min SDRAM Cycle time at CL=X-1 *");
+	printf("%-3d    : %02x %s\n",
+	       24, spd->clk_access2,
+	       " spd->clk_access2, * 24 SDRAM Access from Clock at CL=X-1 *");
+	printf("%-3d    : %02x %s\n",
+	       25, spd->clk_cycle3,
+	       " spd->clk_cycle3,  * 25 Min SDRAM Cycle time at CL=X-2 *");
+	printf("%-3d    : %02x %s\n",
+	       26, spd->clk_access3,
+	       " spd->clk_access3, * 26 Max Access from Clock at CL=X-2 *");
+	printf("%-3d    : %02x %s\n",
+	       27, spd->trp,
+	       " spd->trp,         * 27 Min Row Precharge Time (tRP)*");
+	printf("%-3d    : %02x %s\n",
+	       28, spd->trrd,
+	       " spd->trrd,        * 28 Min Row Active to Row Active (tRRD) *");
+	printf("%-3d    : %02x %s\n",
+	       29, spd->trcd,
+	       " spd->trcd,        * 29 Min RAS to CAS Delay (tRCD) *");
+	printf("%-3d    : %02x %s\n",
+	       30, spd->tras,
+	       " spd->tras,        * 30 Minimum RAS Pulse Width (tRAS) *");
+	printf("%-3d    : %02x %s\n",
+	       31, spd->bank_dens,
+	       " spd->bank_dens,   * 31 Density of each bank on module *");
+	printf("%-3d    : %02x %s\n",
+	       32, spd->ca_setup,
+	       " spd->ca_setup,    * 32 Cmd + Addr signal input setup time *");
+	printf("%-3d    : %02x %s\n",
+	       33, spd->ca_hold,
+	       " spd->ca_hold,     * 33 Cmd and Addr signal input hold time *");
+	printf("%-3d    : %02x %s\n",
+	       34, spd->data_setup,
+	       " spd->data_setup,  * 34 Data signal input setup time *");
+	printf("%-3d    : %02x %s\n",
+	       35, spd->data_hold,
+	       " spd->data_hold,   * 35 Data signal input hold time *");
+	printf("%-3d    : %02x %s\n",
+	       36, spd->res_36_40[0],
+	       " spd->res_36_40[0], * 36 Reserved / tWR *");
+	printf("%-3d    : %02x %s\n",
+	       37, spd->res_36_40[1],
+	       " spd->res_36_40[1], * 37 Reserved / tWTR *");
+	printf("%-3d    : %02x %s\n",
+	       38, spd->res_36_40[2],
+	       " spd->res_36_40[2], * 38 Reserved / tRTP *");
+	printf("%-3d    : %02x %s\n",
+	       39, spd->res_36_40[3],
+	       " spd->res_36_40[3], * 39 Reserved / mem_probe *");
+	printf("%-3d    : %02x %s\n",
+	       40, spd->res_36_40[4],
+	       " spd->res_36_40[4], * 40 Reserved / trc,trfc extensions *");
+	printf("%-3d    : %02x %s\n",
+	       41, spd->trc,
+	       " spd->trc,         * 41 Min Active to Auto refresh time tRC *");
+	printf("%-3d    : %02x %s\n",
+	       42, spd->trfc,
+	       " spd->trfc,        * 42 Min Auto to Active period tRFC *");
+	printf("%-3d    : %02x %s\n",
+	       43, spd->tckmax,
+	       " spd->tckmax,      * 43 Max device cycle time tCKmax *");
+	printf("%-3d    : %02x %s\n",
+	       44, spd->tdqsq,
+	       " spd->tdqsq,       * 44 Max DQS to DQ skew *");
+	printf("%-3d    : %02x %s\n",
+	       45, spd->tqhs,
+	       " spd->tqhs,        * 45 Max Read DataHold skew tQHS *");
+	printf("%-3d    : %02x %s\n",
+	       46, spd->res_46,
+	       " spd->res_46,  * 46 Reserved/ PLL Relock time *");
+	printf("%-3d    : %02x %s\n",
+	       47, spd->dimm_height,
+	       " spd->dimm_height  * 47 SDRAM DIMM Height *");
+
+	printf("%-3d-%3d: ",  48, 61);
+	for (i = 0; i < 14; i++) {
+		printf("%02x", spd->res_48_61[i]);
+	}
+	printf(" * 48-61 IDD in SPD and Reserved space *\n");
+
+	printf("%-3d    : %02x %s\n",
+	       62, spd->spd_rev,
+	       " spd->spd_rev,     * 62 SPD Data Revision Code *");
+	printf("%-3d    : %02x %s\n",
+	       63, spd->cksum,
+	       " spd->cksum,       * 63 Checksum for bytes 0-62 *");
+	printf("%-3d-%3d: ",  64, 71);
+
+	for (i = 0; i < 8; i++) {
+		printf("%02x", spd->mid[i]);
+	}
+
+	printf("* 64 Mfr's JEDEC ID code per JEP-108E *\n");
+	printf("%-3d    : %02x %s\n",
+	       72, spd->mloc,
+	       " spd->mloc,        * 72 Manufacturing Location *");
+
+	printf("%-3d-%3d: >>",  73, 90);
+	for (i = 0; i < 18; i++) {
+		printf("%c", spd->mpart[i]);
+	}
+
+	printf("<<* 73 Manufacturer's Part Number *\n");
+
+	printf("%-3d-%3d: %02x %02x %s\n",
+	       91, 92, spd->rev[0], spd->rev[1],
+	       "* 91 Revision Code *");
+	printf("%-3d-%3d: %02x %02x %s\n",
+	       93, 94, spd->mdate[0], spd->mdate[1],
+	       "* 93 Manufacturing Date *");
+	printf("%-3d-%3d: ", 95, 98);
+
+	for (i = 0; i < 4; i++) {
+		printf("%02x", spd->sernum[i]);
+	}
+	printf("* 95 Assembly Serial Number *\n");
+
+	printf("%-3d-%3d: ", 99, 127);
+	for (i = 0; i < 27; i++) {
+		printf("%02x", spd->mspec[i]);
+	}
+
+	printf("* 99 Manufacturer Specific Data *\n");
+}
+
+void
+ddr2_spd_dump(const ddr2_spd_eeprom_t *spd)
+{
+	unsigned int i;
+
+	printf("%-3d    : %02x %s\n",
+	       0, spd->info_size,
+	       " spd->info_size,   *  0 # bytes written into serial memory *");
+	printf("%-3d    : %02x %s\n",
+	       1, spd->chip_size,
+	       " spd->chip_size,   *  1 Total # bytes of SPD memory device *");
+	printf("%-3d    : %02x %s\n",
+	       2, spd->mem_type,
+	       " spd->mem_type,    *  2 Fundamental memory type *");
+	printf("%-3d    : %02x %s\n",
+	       3, spd->nrow_addr,
+	       " spd->nrow_addr,   *  3 # of Row Addresses on this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       4, spd->ncol_addr,
+	       " spd->ncol_addr,   *  4 # of Column Addrs on this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       5, spd->mod_ranks,
+	       " spd->mod_ranks    *  5 # of Module Rows on this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       6, spd->dataw,
+	       " spd->dataw,       *  6 Data Width of this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       7, spd->res_7,
+	       " spd->res_7,       *  7 Reserved *");
+	printf("%-3d    : %02x %s\n",
+	       8, spd->voltage,
+	       " spd->voltage,     *  8 Voltage intf std of this assembly *");
+	printf("%-3d    : %02x %s\n",
+	       9, spd->clk_cycle,
+	       " spd->clk_cycle,   *  9 SDRAM Cycle time at CL=X *");
+	printf("%-3d    : %02x %s\n",
+	       10, spd->clk_access,
+	       " spd->clk_access,  * 10 SDRAM Access from Clock at CL=X *");
+	printf("%-3d    : %02x %s\n",
+	       11, spd->config,
+	       " spd->config,      * 11 DIMM Configuration type *");
+	printf("%-3d    : %02x %s\n",
+	       12, spd->refresh,
+	       " spd->refresh,     * 12 Refresh Rate/Type *");
+	printf("%-3d    : %02x %s\n",
+	       13, spd->primw,
+	       " spd->primw,       * 13 Primary SDRAM Width *");
+	printf("%-3d    : %02x %s\n",
+	       14, spd->ecw,
+	       " spd->ecw,         * 14 Error Checking SDRAM width *");
+	printf("%-3d    : %02x %s\n",
+	       15, spd->res_15,
+	       " spd->res_15,   * 15 Reserved *");
+	printf("%-3d    : %02x %s\n",
+	       16, spd->burstl,
+	       " spd->burstl,      * 16 Burst Lengths Supported *");
+	printf("%-3d    : %02x %s\n",
+	       17, spd->nbanks,
+	       " spd->nbanks,      * 17 # of Banks on Each SDRAM Device *");
+	printf("%-3d    : %02x %s\n",
+	       18, spd->cas_lat,
+	       " spd->cas_lat,     * 18 CAS# Latencies Supported *");
+	printf("%-3d    : %02x %s\n",
+	       19, spd->mech_char,
+	       " spd->mech_char,   * 19 Mechanical Characteristics *");
+	printf("%-3d    : %02x %s\n",
+	       20, spd->dimm_type,
+	       " spd->dimm_type,   * 20 DIMM type *");
+	printf("%-3d    : %02x %s\n",
+	       21, spd->mod_attr,
+	       " spd->mod_attr,    * 21 SDRAM Module Attributes *");
+	printf("%-3d    : %02x %s\n",
+	       22, spd->dev_attr,
+	       " spd->dev_attr,    * 22 SDRAM Device Attributes *");
+	printf("%-3d    : %02x %s\n",
+	       23, spd->clk_cycle2,
+	       " spd->clk_cycle2,  * 23 Min SDRAM Cycle time at CL=X-1 *");
+	printf("%-3d    : %02x %s\n",
+	       24, spd->clk_access2,
+	       " spd->clk_access2, * 24 SDRAM Access from Clock at CL=X-1 *");
+	printf("%-3d    : %02x %s\n",
+	       25, spd->clk_cycle3,
+	       " spd->clk_cycle3,  * 25 Min SDRAM Cycle time at CL=X-2 *");
+	printf("%-3d    : %02x %s\n",
+	       26, spd->clk_access3,
+	       " spd->clk_access3, * 26 Max Access from Clock at CL=X-2 *");
+	printf("%-3d    : %02x %s\n",
+	       27, spd->trp,
+	       " spd->trp,         * 27 Min Row Precharge Time (tRP)*");
+	printf("%-3d    : %02x %s\n",
+	       28, spd->trrd,
+	       " spd->trrd,        * 28 Min Row Active to Row Active (tRRD) *");
+	printf("%-3d    : %02x %s\n",
+	       29, spd->trcd,
+	       " spd->trcd,        * 29 Min RAS to CAS Delay (tRCD) *");
+	printf("%-3d    : %02x %s\n",
+	       30, spd->tras,
+	       " spd->tras,        * 30 Minimum RAS Pulse Width (tRAS) *");
+	printf("%-3d    : %02x %s\n",
+	       31, spd->rank_dens,
+	       " spd->rank_dens,   * 31 Density of each rank on module *");
+	printf("%-3d    : %02x %s\n",
+	       32, spd->ca_setup,
+	       " spd->ca_setup,    * 32 Cmd + Addr signal input setup time *");
+	printf("%-3d    : %02x %s\n",
+	       33, spd->ca_hold,
+	       " spd->ca_hold,     * 33 Cmd and Addr signal input hold time *");
+	printf("%-3d    : %02x %s\n",
+	       34, spd->data_setup,
+	       " spd->data_setup,  * 34 Data signal input setup time *");
+	printf("%-3d    : %02x %s\n",
+	       35, spd->data_hold,
+	       " spd->data_hold,   * 35 Data signal input hold time *");
+	printf("%-3d    : %02x %s\n",
+	       36, spd->twr,
+	       " spd->twr,         * 36 Write Recovery time tWR *");
+	printf("%-3d    : %02x %s\n",
+	       37, spd->twtr,
+	       " spd->twtr,        * 37 Int write to read delay tWTR *");
+	printf("%-3d    : %02x %s\n",
+	       38, spd->trtp,
+	       " spd->trtp,        * 38 Int read to precharge delay tRTP *");
+	printf("%-3d    : %02x %s\n",
+	       39, spd->mem_probe,
+	       " spd->mem_probe,   * 39 Mem analysis probe characteristics *");
+	printf("%-3d    : %02x %s\n",
+	       40, spd->trctrfc_ext,
+	       " spd->trctrfc_ext, * 40 Extensions to trc and trfc *");
+	printf("%-3d    : %02x %s\n",
+	       41, spd->trc,
+	       " spd->trc,         * 41 Min Active to Auto refresh time tRC *");
+	printf("%-3d    : %02x %s\n",
+	       42, spd->trfc,
+	       " spd->trfc,        * 42 Min Auto to Active period tRFC *");
+	printf("%-3d    : %02x %s\n",
+	       43, spd->tckmax,
+	       " spd->tckmax,      * 43 Max device cycle time tCKmax *");
+	printf("%-3d    : %02x %s\n",
+	       44, spd->tdqsq,
+	       " spd->tdqsq,       * 44 Max DQS to DQ skew *");
+	printf("%-3d    : %02x %s\n",
+	       45, spd->tqhs,
+	       " spd->tqhs,        * 45 Max Read DataHold skew tQHS *");
+	printf("%-3d    : %02x %s\n",
+	       46, spd->pll_relock,
+	       " spd->pll_relock,  * 46 PLL Relock time *");
+	printf("%-3d    : %02x %s\n",
+	       47, spd->Tcasemax,
+	       " spd->Tcasemax,    * 47 Tcasemax *");
+	printf("%-3d    : %02x %s\n",
+	       48, spd->psiTAdram,
+	       " spd->psiTAdram,   * 48 Thermal Resistance of DRAM Package from Top (Case) to Ambient (Psi T-A DRAM) *");
+	printf("%-3d    : %02x %s\n",
+	       49, spd->dt0_mode,
+	       " spd->dt0_mode,    * 49 DRAM Case Temperature Rise from Ambient due to Activate-Precharge/Mode Bits (DT0/Mode Bits) *)");
+	printf("%-3d    : %02x %s\n",
+	       50, spd->dt2n_dt2q,
+	       " spd->dt2n_dt2q,   * 50 DRAM Case Temperature Rise from Ambient due to Precharge/Quiet Standby (DT2N/DT2Q) *");
+	printf("%-3d    : %02x %s\n",
+	       51, spd->dt2p,
+	       " spd->dt2p,        * 51 DRAM Case Temperature Rise from Ambient due to Precharge Power-Down (DT2P) *");
+	printf("%-3d    : %02x %s\n",
+	       52, spd->dt3n,
+	       " spd->dt3n,        * 52 DRAM Case Temperature Rise from Ambient due to Active Standby (DT3N) *");
+	printf("%-3d    : %02x %s\n",
+	       53, spd->dt3pfast,
+	       " spd->dt3pfast,    * 53 DRAM Case Temperature Rise from Ambient due to Active Power-Down with Fast PDN Exit (DT3Pfast) *");
+	printf("%-3d    : %02x %s\n",
+	       54, spd->dt3pslow,
+	       " spd->dt3pslow,    * 54 DRAM Case Temperature Rise from Ambient due to Active Power-Down with Slow PDN Exit (DT3Pslow) *");
+	printf("%-3d    : %02x %s\n",
+	       55, spd->dt4r_dt4r4w,
+	       " spd->dt4r_dt4r4w, * 55 DRAM Case Temperature Rise from Ambient due to Page Open Burst Read/DT4R4W Mode Bit (DT4R/DT4R4W Mode Bit) *");
+	printf("%-3d    : %02x %s\n",
+	       56, spd->dt5b,
+	       " spd->dt5b,        * 56 DRAM Case Temperature Rise from Ambient due to Burst Refresh (DT5B) *");
+	printf("%-3d    : %02x %s\n",
+	       57, spd->dt7,
+	       " spd->dt7,         * 57 DRAM Case Temperature Rise from Ambient due to Bank Interleave Reads with Auto-Precharge (DT7) *");
+	printf("%-3d    : %02x %s\n",
+	       58, spd->psiTApll,
+	       " spd->psiTApll,    * 58 Thermal Resistance of PLL Package form Top (Case) to Ambient (Psi T-A PLL) *");
+	printf("%-3d    : %02x %s\n",
+	       59, spd->psiTAreg,
+	       " spd->psiTAreg,    * 59 Thermal Reisitance of Register Package from Top (Case) to Ambient (Psi T-A Register) *");
+	printf("%-3d    : %02x %s\n",
+	       60, spd->dtpllactive,
+	       " spd->dtpllactive, * 60 PLL Case Temperature Rise from Ambient due to PLL Active (DT PLL Active) *");
+	printf("%-3d    : %02x %s\n",
+	       61, spd->dtregact,
+	       " spd->dtregact,    * 61 Register Case Temperature Rise from Ambient due to Register Active/Mode Bit (DT Register Active/Mode Bit) *");
+	printf("%-3d    : %02x %s\n",
+	       62, spd->spd_rev,
+	       " spd->spd_rev,     * 62 SPD Data Revision Code *");
+	printf("%-3d    : %02x %s\n",
+	       63, spd->cksum,
+	       " spd->cksum,       * 63 Checksum for bytes 0-62 *");
+	printf("%-3d-%3d: ",  64, 71);
+
+	for (i = 0; i < 8; i++) {
+		printf("%02x", spd->mid[i]);
+	}
+
+	printf("* 64 Mfr's JEDEC ID code per JEP-108E *\n");
+	printf("%-3d    : %02x %s\n",
+	       72, spd->mloc,
+	       " spd->mloc,        * 72 Manufacturing Location *");
+
+	printf("%-3d-%3d: >>",  73, 90);
+	for (i = 0; i < 18; i++) {
+		printf("%c", spd->mpart[i]);
+	}
+
+	printf("<<* 73 Manufacturer's Part Number *\n");
+
+	printf("%-3d-%3d: %02x %02x %s\n",
+	       91, 92, spd->rev[0], spd->rev[1],
+	       "* 91 Revision Code *");
+	printf("%-3d-%3d: %02x %02x %s\n",
+	       93, 94, spd->mdate[0], spd->mdate[1],
+	       "* 93 Manufacturing Date *");
+	printf("%-3d-%3d: ", 95, 98);
+
+	for (i = 0; i < 4; i++) {
+		printf("%02x", spd->sernum[i]);
+	}
+	printf("* 95 Assembly Serial Number *\n");
+
+	printf("%-3d-%3d: ", 99, 127);
+	for (i = 0; i < 27; i++) {
+		printf("%02x", spd->mspec[i]);
+	}
+
+	printf("* 99 Manufacturer Specific Data *\n");
+}
+
+/* used for ddr1 and ddr2 spd */
+static int
+spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
+{
+	unsigned int cksum = 0;
+	unsigned int i;
+
+	/*
+	 * Check SPD revision supported
+	 * Rev 1.2 or less supported by this code
+	 */
+	if (spd_rev > 0x12) {
+		printf("SPD revision %02X not supported by this code\n",
+		       spd_rev);
+		return 1;
+	}
+
+	/*
+	 * Calculate checksum
+	 */
+	for (i = 0; i < 63; i++) {
+		cksum += *buf++;
+	}
+	cksum &= 0xFF;
+
+	if (cksum != spd_cksum) {
+		printf("SPD checksum unexpected. "
+			"Checksum in SPD = %02X, computed SPD = %02X\n",
+			spd_cksum, cksum);
+		return 1;
+	}
+
+	return 0;
+}
+
+unsigned int
+ddr1_spd_check(const ddr1_spd_eeprom_t *spd)
+{
+	const u8 *p = (const u8 *)spd;
+
+	return spd_check(p, spd->spd_rev, spd->cksum);
+}
+
+unsigned int
+ddr2_spd_check(const ddr2_spd_eeprom_t *spd)
+{
+	const u8 *p = (const u8 *)spd;
+
+	return spd_check(p, spd->spd_rev, spd->cksum);
+}
diff --git a/include/ddr_spd.h b/include/ddr_spd.h
new file mode 100644
index 0000000..1a1c99b
--- /dev/null
+++ b/include/ddr_spd.h
@@ -0,0 +1,249 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#ifndef _DDR_SPD_H_
+#define _DDR_SPD_H_
+
+/*
+ * Format from "JEDEC Standard No. 21-C,
+ * Appendix D: Rev 1.0: SPD's for DDR SDRAM
+ */
+typedef struct ddr1_spd_eeprom_s {
+	unsigned char info_size;   /*  0 # bytes written into serial memory */
+	unsigned char chip_size;   /*  1 Total # bytes of SPD memory device */
+	unsigned char mem_type;    /*  2 Fundamental memory type */
+	unsigned char nrow_addr;   /*  3 # of Row Addresses on this assembly */
+	unsigned char ncol_addr;   /*  4 # of Column Addrs on this assembly */
+	unsigned char nrows;       /*  5 Number of DIMM Banks */
+	unsigned char dataw_lsb;   /*  6 Data Width of this assembly */
+	unsigned char dataw_msb;   /*  7 ... Data Width continuation */
+	unsigned char voltage;     /*  8 Voltage intf std of this assembly */
+	unsigned char clk_cycle;   /*  9 SDRAM Cycle time at CL=X */
+	unsigned char clk_access;  /* 10 SDRAM Access from Clock at CL=X (tAC) */
+	unsigned char config;      /* 11 DIMM Configuration type */
+	unsigned char refresh;     /* 12 Refresh Rate/Type */
+	unsigned char primw;       /* 13 Primary SDRAM Width */
+	unsigned char ecw;         /* 14 Error Checking SDRAM width */
+	unsigned char min_delay;   /* 15 for Back to Back Random Address */
+	unsigned char burstl;      /* 16 Burst Lengths Supported */
+	unsigned char nbanks;      /* 17 # of Banks on SDRAM Device */
+	unsigned char cas_lat;     /* 18 CAS# Latencies Supported */
+	unsigned char cs_lat;      /* 19 CS# Latency */
+	unsigned char write_lat;   /* 20 Write Latency (aka Write Recovery) */
+	unsigned char mod_attr;    /* 21 SDRAM Module Attributes */
+	unsigned char dev_attr;    /* 22 SDRAM Device Attributes */
+	unsigned char clk_cycle2;  /* 23 Min SDRAM Cycle time at CL=X-0.5 */
+	unsigned char clk_access2; /* 24 SDRAM Access from Clock at CL=X-0.5 (tAC) */
+	unsigned char clk_cycle3;  /* 25 Min SDRAM Cycle time at CL=X-1 */
+	unsigned char clk_access3; /* 26 Max Access from Clock at CL=X-1 (tAC) */
+	unsigned char trp;         /* 27 Min Row Precharge Time (tRP)*/
+	unsigned char trrd;        /* 28 Min Row Active to Row Active (tRRD) */
+	unsigned char trcd;        /* 29 Min RAS to CAS Delay (tRCD) */
+	unsigned char tras;        /* 30 Minimum RAS Pulse Width (tRAS) */
+	unsigned char bank_dens;   /* 31 Density of each bank on module */
+	unsigned char ca_setup;    /* 32 Addr + Cmd Setup Time Before Clock */
+	unsigned char ca_hold;     /* 33 Addr + Cmd Hold Time After Clock */
+	unsigned char data_setup;  /* 34 Data Input Setup Time Before Strobe */
+	unsigned char data_hold;   /* 35 Data Input Hold Time After Strobe */
+	unsigned char res_36_40[5];/* 36-40 reserved for VCSDRAM */
+	unsigned char trc;         /* 41 Min Active to Auto refresh time tRC */
+	unsigned char trfc;        /* 42 Min Auto to Active period tRFC */
+	unsigned char tckmax;      /* 43 Max device cycle time tCKmax */
+	unsigned char tdqsq;       /* 44 Max DQS to DQ skew (tDQSQ max) */
+	unsigned char tqhs;        /* 45 Max Read DataHold skew (tQHS) */
+	unsigned char res_46;      /* 46 Reserved */
+	unsigned char dimm_height; /* 47 DDR SDRAM DIMM Height */
+	unsigned char res_48_61[14]; /* 48-61 Reserved */
+	unsigned char spd_rev;     /* 62 SPD Data Revision Code */
+	unsigned char cksum;       /* 63 Checksum for bytes 0-62 */
+	unsigned char mid[8];      /* 64-71 Mfr's JEDEC ID code per JEP-106 */
+	unsigned char mloc;        /* 72 Manufacturing Location */
+	unsigned char mpart[18];   /* 73 Manufacturer's Part Number */
+	unsigned char rev[2];      /* 91 Revision Code */
+	unsigned char mdate[2];    /* 93 Manufacturing Date */
+	unsigned char sernum[4];   /* 95 Assembly Serial Number */
+	unsigned char mspec[27];   /* 99-127 Manufacturer Specific Data */
+
+} ddr1_spd_eeprom_t;
+
+/*
+ * Format from "JEDEC Appendix X: Serial Presence Detects for DDR2 SDRAM",
+ * SPD Revision 1.2
+ */
+typedef struct ddr2_spd_eeprom_s {
+	unsigned char info_size;   /*  0 # bytes written into serial memory */
+	unsigned char chip_size;   /*  1 Total # bytes of SPD memory device */
+	unsigned char mem_type;    /*  2 Fundamental memory type */
+	unsigned char nrow_addr;   /*  3 # of Row Addresses on this assembly */
+	unsigned char ncol_addr;   /*  4 # of Column Addrs on this assembly */
+	unsigned char mod_ranks;   /*  5 Number of DIMM Ranks */
+	unsigned char dataw;       /*  6 Module Data Width */
+	unsigned char res_7;       /*  7 Reserved */
+	unsigned char voltage;     /*  8 Voltage intf std of this assembly */
+	unsigned char clk_cycle;   /*  9 SDRAM Cycle time at CL=X */
+	unsigned char clk_access;  /* 10 SDRAM Access from Clock at CL=X (tAC) */
+	unsigned char config;      /* 11 DIMM Configuration type */
+	unsigned char refresh;     /* 12 Refresh Rate/Type */
+	unsigned char primw;       /* 13 Primary SDRAM Width */
+	unsigned char ecw;         /* 14 Error Checking SDRAM width */
+	unsigned char res_15;      /* 15 Reserved */
+	unsigned char burstl;      /* 16 Burst Lengths Supported */
+	unsigned char nbanks;      /* 17 # of Banks on Each SDRAM Device */
+	unsigned char cas_lat;     /* 18 CAS# Latencies Supported */
+	unsigned char mech_char;   /* 19 DIMM Mechanical Characteristics */
+	unsigned char dimm_type;   /* 20 DIMM type information */
+	unsigned char mod_attr;    /* 21 SDRAM Module Attributes */
+	unsigned char dev_attr;    /* 22 SDRAM Device Attributes */
+	unsigned char clk_cycle2;  /* 23 Min SDRAM Cycle time at CL=X-1 */
+	unsigned char clk_access2; /* 24 SDRAM Access from Clock at CL=X-1 (tAC) */
+	unsigned char clk_cycle3;  /* 25 Min SDRAM Cycle time at CL=X-2 */
+	unsigned char clk_access3; /* 26 Max Access from Clock at CL=X-2 (tAC) */
+	unsigned char trp;         /* 27 Min Row Precharge Time (tRP)*/
+	unsigned char trrd;        /* 28 Min Row Active to Row Active (tRRD) */
+	unsigned char trcd;        /* 29 Min RAS to CAS Delay (tRCD) */
+	unsigned char tras;        /* 30 Minimum RAS Pulse Width (tRAS) */
+	unsigned char rank_dens;   /* 31 Density of each rank on module */
+	unsigned char ca_setup;    /* 32 Addr + Cmd Setup Time Before Clock (tIS) */
+	unsigned char ca_hold;     /* 33 Addr + Cmd Hold Time After Clock (tIH) */
+	unsigned char data_setup;  /* 34 Data Input Setup Time Before Strobe (tDS) */
+	unsigned char data_hold;   /* 35 Data Input Hold Time After Strobe (tDH) */
+	unsigned char twr;         /* 36 Write Recovery time tWR */
+	unsigned char twtr;        /* 37 Int write to read delay tWTR */
+	unsigned char trtp;        /* 38 Int read to precharge delay tRTP */
+	unsigned char mem_probe;   /* 39 Mem analysis probe characteristics */
+	unsigned char trctrfc_ext; /* 40 Extensions to trc and trfc */
+	unsigned char trc;         /* 41 Min Active to Auto refresh time tRC */
+	unsigned char trfc;        /* 42 Min Auto to Active period tRFC */
+	unsigned char tckmax;      /* 43 Max device cycle time tCKmax */
+	unsigned char tdqsq;       /* 44 Max DQS to DQ skew (tDQSQ max) */
+	unsigned char tqhs;        /* 45 Max Read DataHold skew (tQHS) */
+	unsigned char pll_relock;  /* 46 PLL Relock time */
+	unsigned char Tcasemax;    /* 47 Tcasemax */
+	unsigned char psiTAdram;   /* 48 Thermal Resistance of DRAM Package from Top (Case) to Ambient (Psi T-A DRAM) */
+	unsigned char dt0_mode;    /* 49 DRAM Case Temperature Rise from Ambient due to Activate-Precharge/Mode Bits (DT0/Mode Bits) */
+	unsigned char dt2n_dt2q;   /* 50 DRAM Case Temperature Rise from Ambient due to Precharge/Quiet Standby (DT2N/DT2Q) */
+	unsigned char dt2p;        /* 51 DRAM Case Temperature Rise from Ambient due to Precharge Power-Down (DT2P) */
+	unsigned char dt3n;        /* 52 DRAM Case Temperature Rise from Ambient due to Active Standby (DT3N) */
+	unsigned char dt3pfast;    /* 53 DRAM Case Temperature Rise from Ambient due to Active Power-Down with Fast PDN Exit (DT3Pfast) */
+	unsigned char dt3pslow;    /* 54 DRAM Case Temperature Rise from Ambient due to Active Power-Down with Slow PDN Exit (DT3Pslow) */
+	unsigned char dt4r_dt4r4w; /* 55 DRAM Case Temperature Rise from Ambient due to Page Open Burst Read/DT4R4W Mode Bit (DT4R/DT4R4W Mode Bit) */
+	unsigned char dt5b;        /* 56 DRAM Case Temperature Rise from Ambient due to Burst Refresh (DT5B) */
+	unsigned char dt7;         /* 57 DRAM Case Temperature Rise from Ambient due to Bank Interleave Reads with Auto-Precharge (DT7) */
+	unsigned char psiTApll;    /* 58 Thermal Resistance of PLL Package form Top (Case) to Ambient (Psi T-A PLL) */
+	unsigned char psiTAreg;    /* 59 Thermal Reisitance of Register Package from Top (Case) to Ambient (Psi T-A Register) */
+	unsigned char dtpllactive; /* 60 PLL Case Temperature Rise from Ambient due to PLL Active (DT PLL Active) */
+	unsigned char dtregact;    /* 61 Register Case Temperature Rise from Ambient due to Register Active/Mode Bit (DT Register Active/Mode Bit) */
+
+	unsigned char spd_rev;     /* 62 SPD Data Revision Code */
+	unsigned char cksum;       /* 63 Checksum for bytes 0-62 */
+	unsigned char mid[8];      /* 64 Mfr's JEDEC ID code per JEP-106 */
+	unsigned char mloc;        /* 72 Manufacturing Location */
+	unsigned char mpart[18];   /* 73 Manufacturer's Part Number */
+	unsigned char rev[2];      /* 91 Revision Code */
+	unsigned char mdate[2];    /* 93 Manufacturing Date */
+	unsigned char sernum[4];   /* 95 Assembly Serial Number */
+	unsigned char mspec[27];   /* 99-127 Manufacturer Specific Data */
+
+} ddr2_spd_eeprom_t;
+
+typedef struct ddr3_spd_eeprom_s {
+	/* General Section: Bytes 0-59 */
+	unsigned char info_size_crc;   /*  0 # bytes written into serial memory, CRC coverage */
+	unsigned char spd_rev;         /*  1 Total # bytes of SPD memory device */
+	unsigned char mem_type;        /*  2 Key Byte / Fundamental memory type */
+	unsigned char module_type;     /*  3 Key Byte / Module Type */
+	unsigned char density_banks;   /*  4 SDRAM Density and Banks */
+	unsigned char addressing;      /*  5 SDRAM Addressing */
+	unsigned char res_6;           /*  6 Reserved */
+	unsigned char organization;    /*  7 Module Organization */
+	unsigned char bus_width;       /*  8 Module Memory Bus Width */
+	unsigned char ftb_div;         /*  9 Fine Timebase (FTB) Dividend / Divisor */
+	unsigned char mtb_dividend;    /* 10 Medium Timebase (MTB) Dividend */
+	unsigned char mtb_divisor;     /* 11 Medium Timebase (MTB) Divisor */
+	unsigned char tCK_min;         /* 12 SDRAM Minimum Cycle Time (tCK_min) */
+	unsigned char res_13;          /* 13 Reserved */
+	unsigned char caslat_lsb;      /* 14 CAS Latencies Supported, Least Significant Byte */
+	unsigned char caslat_msb;      /* 15 CAS Latencies Supported, Most Significant Byte */
+	unsigned char tAA_min;         /* 16 Minimum CAS Latency Time (tAA_min) */
+	unsigned char tWR_min;         /* 17 Minimum WRite REcovery Time (tWR_min) */
+	unsigned char tRCD_min;        /* 18 Minimum RAS# to CAS# Delay Time (tRCD_min) */
+	unsigned char tRRD_min;        /* 19 Minimum Row Active to Row Active Delay Time (tRRD_min) */
+	unsigned char tRP_min;         /* 20 Minimum Row Precharge Delay Time (tRP_min) */
+	unsigned char tRAS_tRC_ext;    /* 21 Upper Nibbles for tRAS and tRC */
+	unsigned char tRAS_min_lsb;    /* 22 Minimum Active to Precharge Delay Time (tRAS_min), LSB */
+	unsigned char tRC_min_lsb;     /* 23 Minimum Active to Active/Refresh Delay Time (tRC_min), LSB */
+	unsigned char tRFC_min_lsb;    /* 24 Minimum Refresh Recovery Delay Time (tRFC_min), LSB */
+	unsigned char tRFC_min_msb;    /* 25 Minimum Refresh Recovery Delay Time (tRFC_min), MSB */
+	unsigned char tWTR_min;        /* 26 Minimum Internal Write to Read Command Delay Time (tWTR_min) */
+	unsigned char tRTP_min;        /* 27 Minimum Internal Read to Precharge Command Delay Time (tRTP_min) */
+	unsigned char tFAW_msb;        /* 28 Upper Nibble for tFAW */
+	unsigned char tFAW_min;        /* 29 Minimum Four Activate Window Delay Time (tFAW_min), LSB */
+	unsigned char opt_features;    /* 30 SDRAM Optional Features */
+	unsigned char therm_ref_opt;   /* 31 SDRAM Thermal and Refresh Options */
+	unsigned char res_32_59[28];   /* 32-59 Reserved, General Section */
+
+	/* Module-Specific Section: Bytes 60-116 */
+	union {
+		struct {
+			unsigned char mod_height;    /* 60 (Unbuffered) Module Nominal Height */
+			unsigned char mod_thickness; /* 61 (Unbuffered) Module Maximum Thickness */
+			unsigned char ref_raw_card;  /* 62 (Unbuffered) Reference Raw Card Used */
+			unsigned char addr_mapping;  /* 63 (Unbuffered) Address Mapping from Edge Connector to DRAM */
+			unsigned char res_64_116[53]; /* 64-116 (Unbuffered) Reserved */
+		} unbuffered;
+		struct {
+			unsigned char mod_height;    /* 60 (Registered) Module Nominal Height */
+			unsigned char mod_thickness; /* 61 (Registered) Module Maximum Thickness */
+			unsigned char ref_raw_card;  /* 62 (Registered) Reference Raw Card Used */
+		} registered;
+		unsigned char uc[57]; /* 60-116 Module-Specific Section */
+	} mod_section;
+
+	/* Unique Module ID: Bytes 117-125 */
+	unsigned char mmid_lsb;        /* 117 Module Manufacturer ID Code LSB - JEP-106 */
+	unsigned char mmid_msb;        /* 118 Module Manufacturer ID Code MSB - JEP-106 */
+	unsigned char mloc;            /* 119 Manufacturing Location */
+	unsigned char mdate[2];        /* 120-121 Manufacturing Date */
+	unsigned char sernum[4];       /* 122-125 Module Serial Number */
+
+	/* CRC: Bytes 126-127 */
+	unsigned char crc[2];          /* 126-127 SPD Cyclical Redundancy Code (CRC) */
+
+	/* Other Manufacturer Fields and User Space: Bytes 128-255 */
+	unsigned char mpart[18];       /* 128-145 Manufacturer's Module Part Number */
+	unsigned char mrev[2];         /* 146-147 Module Revision Code */
+
+	unsigned char dmid_lsb;        /* 148 DRAM Manufacturer ID Code LSB - JEP-106 */
+	unsigned char dmid_msb;        /* 149 DRAM Manufacturer ID Code MSB - JEP-106 */
+
+	unsigned char msd[26];         /* 150-175 Manufacturer's Specific Data */
+	unsigned char cust[80];        /* 176-255 Open for Customer Use */
+
+} ddr3_spd_eeprom_t;
+
+extern unsigned int ddr1_spd_check(const ddr1_spd_eeprom_t *spd);
+extern void ddr1_spd_dump(const ddr1_spd_eeprom_t *spd);
+extern unsigned int ddr2_spd_check(const ddr2_spd_eeprom_t *spd);
+extern void ddr2_spd_dump(const ddr2_spd_eeprom_t *spd);
+
+/*
+ * Byte 2 Fundamental Memory Types.
+ */
+#define SPD_MEMTYPE_FPM		(0x01)
+#define SPD_MEMTYPE_EDO		(0x02)
+#define SPD_MEMTYPE_PIPE_NIBBLE	(0x03)
+#define SPD_MEMTYPE_SDRAM	(0x04)
+#define SPD_MEMTYPE_ROM		(0x05)
+#define SPD_MEMTYPE_SGRAM	(0x06)
+#define SPD_MEMTYPE_DDR		(0x07)
+#define SPD_MEMTYPE_DDR2	(0x08)
+#define SPD_MEMTYPE_DDR2_FBDIMM	(0x09)
+#define SPD_MEMTYPE_DDR2_FBDIMM_PROBE	(0x0A)
+#define SPD_MEMTYPE_DDR3	(0x0B)
+
+#endif /* _DDR_SPD_H_ */
-- 
1.5.5.1




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