[PATCH v2 2/5] imx8mm-cl-iot-gate: Retrieve the DDR type from EEPROM
Fabio Estevam
festevam at gmail.com
Tue Apr 12 18:05:36 CEST 2022
From: Fabio Estevam <festevam at denx.de>
Currently, the DDR type is retrieved by iteracting inside an array
of possible DDR types.
This may take saveral attempts, which slows the overall U-Boot process
and does not provide a good user experience:
U-Boot SPL 2021.07 (Feb 28 2022 - 06:39:32 +0000)
DDRINFO: Cfg attempt: [ 1/6 ]
DDRINFO(M): mr5-8 [ 0xff000010 ]
DDRINFO(T): mr5-8 [ 0x5000010 ]
resetting ...
U-Boot SPL 2021.07 (Feb 28 2022 - 06:39:32 +0000)
DDRINFO: Cfg attempt: [ 2/6 ]
DDRINFO(M): mr5-8 [ 0xff000010 ]
DDRINFO(T): mr5-8 [ 0x1061010 ]
resetting ...
U-Boot SPL 2021.07 (Feb 28 2022 - 06:39:32 +0000)
DDRINFO: Cfg attempt: [ 3/6 ]
DDRINFO(M): mr5-8 [ 0xff000010 ]
DDRINFO(T): mr5-8 [ 0xff000010 ]
Normal Boot
WDT: Not starting
Trying to boot from MMC2
NOTICE: BL31: v2.5(release):v2.5
NOTICE: BL31: Built : 07:12:44, Jan 24 2022
Improve the boot time by retrieving the correct DDR information from
the EEPROM:
U-Boot SPL 2022.04-rc4-00045-g6d02bc40d58c (Mar 19 2022 - 08:22:29 -0300)
DDRINFO(D): Kingston 4096G
DDRINFO(M): mr5-8 [ 0xff000010 ]
DDRINFO(E): mr5-8 [ 0xff000010 ]
Normal Boot
WDT: Started watchdog at 30280000 with servicing (60s timeout)
Trying to boot from MMC2
NOTICE: BL31: v2.5(release):v2.5
NOTICE: BL31: Built : 22:28:11, Mar 15 2022
Based on the original code from Compulab's U-Boot.
Tested on a imx8mm-cl-iot-gate board populated with 4GB of RAM.
Signed-off-by: Fabio Estevam <festevam at denx.de>
---
Changes since v1:
- None
board/compulab/imx8mm-cl-iot-gate/ddr/ddr.c | 24 ++++++++++++++++++---
board/compulab/imx8mm-cl-iot-gate/ddr/ddr.h | 5 +++++
2 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.c b/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.c
index 42dd0dbf18fa..5b93491923e9 100644
--- a/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.c
+++ b/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.c
@@ -22,6 +22,8 @@
#include <asm/mach-imx/gpio.h>
#include "ddr.h"
+#include <linux/delay.h>
+
static unsigned int lpddr4_mr_read(unsigned int mr_rank, unsigned int mr_addr)
{
unsigned int tmp;
@@ -137,10 +139,11 @@ void spl_dram_init_compulab(void)
(struct lpddr4_tcm_desc *)SPL_TCM_DATA;
if (lpddr4_tcm_desc->sign != DEFAULT) {
- /* if not in tcm scan mode */
+ /* get ddr type from the eeprom if not in tcm scan mode */
+ ddr_info = cl_eeprom_get_ddrinfo();
for (i = 0; i < ARRAY_SIZE(lpddr4_array); i++) {
if (lpddr4_array[i].id == ddr_info &&
- lpddr4_array[i].subind == 0xff) {
+ lpddr4_array[i].subind == cl_eeprom_get_subind()) {
ddr_found = 1;
break;
}
@@ -198,10 +201,25 @@ void spl_dram_init_compulab(void)
SPL_TCM_FINI;
+ if (ddr_found == 0) {
+ /* Update eeprom */
+ cl_eeprom_set_ddrinfo(ddr_info_mrr);
+ mdelay(10);
+ ddr_info = cl_eeprom_get_ddrinfo();
+ mdelay(10);
+ cl_eeprom_set_subind(lpddr4_array[i].subind);
+ /* make sure that the ddr_info has reached the eeprom */
+ printf("DDRINFO(E): mr5-8 [ 0x%x ], read back\n", ddr_info);
+ if (ddr_info_mrr != ddr_info || cl_eeprom_get_subind() != lpddr4_array[i].subind) {
+ printf("DDRINFO(EEPROM): make sure that the eeprom is accessible\n");
+ printf("DDRINFO(EEPROM): i2c dev 1; i2c md 0x51 0x40 0x50\n");
+ }
+ }
+
/* Pass the dram size to th U-Boot through the tcm memory */
{ /* To figure out what to store into the TCM buffer */
/* For debug purpouse only. To override the real memsize */
- unsigned int ddr_tcm_size = 0;
+ unsigned int ddr_tcm_size = cl_eeprom_get_osize();
if (ddr_tcm_size == 0 || ddr_tcm_size == -1)
ddr_tcm_size = lpddr4_array[i].size;
diff --git a/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.h b/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.h
index 59c18911592e..f7d4fdc1016a 100644
--- a/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.h
+++ b/board/compulab/imx8mm-cl-iot-gate/ddr/ddr.h
@@ -23,4 +23,9 @@ struct lpddr4_tcm_desc {
unsigned int count;
};
+u32 cl_eeprom_get_ddrinfo(void);
+u32 cl_eeprom_set_ddrinfo(u32 ddrinfo);
+u32 cl_eeprom_get_subind(void);
+u32 cl_eeprom_set_subind(u32 subind);
+u32 cl_eeprom_get_osize(void);
#endif
--
2.25.1
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