[U-Boot] [PATCH 1/3] OMAP3: Consolidate SDRC related operations

hvaibhav at ti.com hvaibhav at ti.com
Sat Jan 30 11:16:49 CET 2010


From: Vaibhav Hiremath <hvaibhav at ti.com>

Consolidated all SDRC related functions/operations into separate
file - sdrc.c.

Signed-off-by: Vaibhav Hiremath <hvaibhav at ti.com>
Signed-off-by: Sanjeev Premi <premi at ti.com>
---
 cpu/arm_cortexa8/omap3/Makefile        |    3 +
 cpu/arm_cortexa8/omap3/board.c         |   34 +------
 cpu/arm_cortexa8/omap3/mem.c           |   90 ---------------
 cpu/arm_cortexa8/omap3/sdrc.c          |  186 ++++++++++++++++++++++++++++++++
 cpu/arm_cortexa8/omap3/sys_info.c      |   42 +-------
 include/asm-arm/arch-omap3/mem.h       |   14 +++
 include/asm-arm/arch-omap3/sys_proto.h |    4 +-
 include/configs/omap3_beagle.h         |    2 +
 include/configs/omap3_evm.h            |    2 +
 include/configs/omap3_overo.h          |    2 +
 include/configs/omap3_pandora.h        |    2 +
 include/configs/omap3_sdp3430.h        |    2 +
 include/configs/omap3_zoom1.h          |    2 +
 include/configs/omap3_zoom2.h          |    2 +
 14 files changed, 221 insertions(+), 166 deletions(-)
 create mode 100644 cpu/arm_cortexa8/omap3/sdrc.c

diff --git a/cpu/arm_cortexa8/omap3/Makefile b/cpu/arm_cortexa8/omap3/Makefile
index 136b163..8cc7802 100644
--- a/cpu/arm_cortexa8/omap3/Makefile
+++ b/cpu/arm_cortexa8/omap3/Makefile
@@ -33,6 +33,9 @@ COBJS	+= board.o
 COBJS	+= clock.o
 COBJS	+= gpio.o
 COBJS	+= mem.o
+ifdef	CONFIG_SDRC
+COBJS	+= sdrc.o
+endif
 COBJS	+= syslib.o
 COBJS	+= sys_info.o
 COBJS	+= timer.o
diff --git a/cpu/arm_cortexa8/omap3/board.c b/cpu/arm_cortexa8/omap3/board.c
index 2aa69b3..0bad682 100644
--- a/cpu/arm_cortexa8/omap3/board.c
+++ b/cpu/arm_cortexa8/omap3/board.c
@@ -40,8 +40,6 @@

 extern omap3_sysinfo sysinfo;

-extern u32 is_mem_sdr(void);
-
 /******************************************************************************
  * Routine: delay
  * Description: spinning delay to use before udelay works
@@ -227,7 +225,7 @@ void s_init(void)
 	per_clocks_enable();

 	if (!in_sdram)
-		sdrc_init();
+		mem_init();
 }

 /******************************************************************************
@@ -268,36 +266,6 @@ void watchdog_init(void)
 }

 /******************************************************************************
- * Routine: dram_init
- * Description: sets uboots idea of sdram size
- *****************************************************************************/
-int dram_init(void)
-{
-	DECLARE_GLOBAL_DATA_PTR;
-	unsigned int size0 = 0, size1 = 0;
-
-	/*
-	 * If a second bank of DDR is attached to CS1 this is
-	 * where it can be started.  Early init code will init
-	 * memory on CS0.
-	 */
-	if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED)) {
-		do_sdrc_init(CS1, NOT_EARLY);
-		make_cs1_contiguous();
-	}
-
-	size0 = get_sdr_cs_size(CS0);
-	size1 = get_sdr_cs_size(CS1);
-
-	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
-	gd->bd->bi_dram[0].size = size0;
-	gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
-	gd->bd->bi_dram[1].size = size1;
-
-	return 0;
-}
-
-/******************************************************************************
  * Dummy function to handle errors for EABI incompatibility
  *****************************************************************************/
 void abort(void)
diff --git a/cpu/arm_cortexa8/omap3/mem.c b/cpu/arm_cortexa8/omap3/mem.c
index dfb7e4c..bd914b0 100644
--- a/cpu/arm_cortexa8/omap3/mem.c
+++ b/cpu/arm_cortexa8/omap3/mem.c
@@ -79,26 +79,6 @@ static const u32 gpmc_onenand[GPMC_MAX_REG] = {

 #endif

-static struct sdrc *sdrc_base = (struct sdrc *)OMAP34XX_SDRC_BASE;
-
-/**************************************************************************
- * make_cs1_contiguous() - for es2 and above remap cs1 behind cs0 to allow
- *  command line mem=xyz use all memory with out discontinuous support
- *  compiled in.  Could do it at the ATAG, but there really is two banks...
- * Called as part of 2nd phase DDR init.
- **************************************************************************/
-void make_cs1_contiguous(void)
-{
-	u32 size, a_add_low, a_add_high;
-
-	size = get_sdr_cs_size(CS0);
-	size >>= 25;	/* divide by 32 MiB to find size to offset CS1 */
-	a_add_high = (size & 3) << 8;	/* set up low field */
-	a_add_low = (size & 0x3C) >> 2;	/* set up high field */
-	writel((a_add_high | a_add_low), &sdrc_base->cs_cfg);
-
-}
-
 /********************************************************
  *  mem_ok() - test used to see if timings are correct
  *             for a part. Helps in guessing which part
@@ -123,76 +103,6 @@ u32 mem_ok(u32 cs)
 		return 1;
 }

-/********************************************************
- *  sdrc_init() - init the sdrc chip selects CS0 and CS1
- *  - early init routines, called from flash or
- *  SRAM.
- *******************************************************/
-void sdrc_init(void)
-{
-	/* only init up first bank here */
-	do_sdrc_init(CS0, EARLY_INIT);
-}
-
-/*************************************************************************
- * do_sdrc_init(): initialize the SDRAM for use.
- *  -code sets up SDRAM basic SDRC timings for CS0
- *  -optimal settings can be placed here, or redone after i2c
- *      inspection of board info
- *
- *  - code called once in C-Stack only context for CS0 and a possible 2nd
- *      time depending on memory configuration from stack+global context
- **************************************************************************/
-
-void do_sdrc_init(u32 cs, u32 early)
-{
-	struct sdrc_actim *sdrc_actim_base;
-
-	if(cs)
-		sdrc_actim_base = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE;
-	else
-		sdrc_actim_base = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE;
-
-	if (early) {
-		/* reset sdrc controller */
-		writel(SOFTRESET, &sdrc_base->sysconfig);
-		wait_on_value(RESETDONE, RESETDONE, &sdrc_base->status,
-			      12000000);
-		writel(0, &sdrc_base->sysconfig);
-
-		/* setup sdrc to ball mux */
-		writel(SDRC_SHARING, &sdrc_base->sharing);
-
-		/* Disable Power Down of CKE cuz of 1 CKE on combo part */
-		writel(WAKEUPPROC | PWDNEN | SRFRONRESET | PAGEPOLICY_HIGH,
-				&sdrc_base->power);
-
-		writel(ENADLL | DLLPHASE_90, &sdrc_base->dlla_ctrl);
-		sdelay(0x20000);
-	}
-
-	writel(RASWIDTH_13BITS | CASWIDTH_10BITS | ADDRMUXLEGACY |
-		RAMSIZE_128 | BANKALLOCATION | B32NOT16 | B32NOT16 |
-		DEEPPD | DDR_SDRAM, &sdrc_base->cs[cs].mcfg);
-	writel(ARCV | ARE_ARCV_1, &sdrc_base->cs[cs].rfr_ctrl);
-	writel(V_ACTIMA_165, &sdrc_actim_base->ctrla);
-	writel(V_ACTIMB_165, &sdrc_actim_base->ctrlb);
-
-	writel(CMD_NOP, &sdrc_base ->cs[cs].manual);
-	writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual);
-	writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
-	writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
-
-	/*
-	 * CAS latency 3, Write Burst = Read Burst, Serial Mode,
-	 * Burst length = 4
-	 */
-	writel(CASL3 | BURSTLENGTH4, &sdrc_base->cs[cs].mr);
-
-	if (!mem_ok(cs))
-		writel(0, &sdrc_base->cs[cs].mcfg);
-}
-
 void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base,
 			u32 size)
 {
diff --git a/cpu/arm_cortexa8/omap3/sdrc.c b/cpu/arm_cortexa8/omap3/sdrc.c
new file mode 100644
index 0000000..9a46155
--- /dev/null
+++ b/cpu/arm_cortexa8/omap3/sdrc.c
@@ -0,0 +1,186 @@
+/*
+ * Functions related to SDRC.
+ *
+ * This file has been created after exctracting and consolidating
+ * the SDRC related content from mem.c and board.c.
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/sys_proto.h>
+
+extern omap3_sysinfo sysinfo;
+
+static struct sdrc *sdrc_base = (struct sdrc *)OMAP34XX_SDRC_BASE;
+
+/**
+ * make_cs1_contiguous() - for es2 and above remap cs1 behind cs0 to allow
+ *  command line mem=xyz use all memory with out discontinuous support
+ *  compiled in.  Could do it at the ATAG, but there really is two banks...
+ * Called as part of 2nd phase DDR init.
+ */
+void make_cs1_contiguous(void)
+{
+	u32 size, a_add_low, a_add_high;
+
+	size = get_sdr_cs_size(CS0);
+	size >>= 25;	/* divide by 32 MiB to find size to offset CS1 */
+	a_add_high = (size & 3) << 8;	/* set up low field */
+	a_add_low = (size & 0x3C) >> 2;	/* set up high field */
+	writel((a_add_high | a_add_low), &sdrc_base->cs_cfg);
+
+}
+/**
+ * is_mem_sdr() - return 1 if mem type in use is SDR
+ */
+u32 is_mem_sdr(void)
+{
+	if (readl(&sdrc_base->cs[CS0].mr) == SDRC_MR_0_SDR)
+		return 1;
+	return 0;
+}
+
+/**
+ * get_sdr_cs_size() - get size of chip select 0/1
+ */
+u32 get_sdr_cs_size(u32 cs)
+{
+	u32 size;
+
+	/* get ram size field */
+	size = readl(&sdrc_base->cs[cs].mcfg) >> 8;
+	size &= 0x3FF;		/* remove unwanted bits */
+	size <<= 21;		/* multiply by 2 MiB to find size in MB */
+	return size;
+}
+
+/**
+ * get_sdr_cs_offset() - get offset of cs from cs0 start
+ */
+u32 get_sdr_cs_offset(u32 cs)
+{
+	u32 offset;
+
+	if (!cs)
+		return 0;
+
+	offset = readl(&sdrc_base->cs_cfg);
+	offset = (offset & 15) << 27 | (offset & 0x30) >> 17;
+
+	return offset;
+}
+
+/**
+ * do_sdrc_init(): initialize the SDRAM for use.
+ *  -Sets up SDRAM basic SDRC timings for CS0
+ *  -Optimal settings can be placed here, or redone after i2c
+ *      inspection of board info
+ *
+ *  - code called once in C-Stack only context for CS0 and a possible 2nd
+ *    time depending on memory configuration from stack+global context
+ */
+void do_sdrc_init(u32 cs, u32 early)
+{
+	struct sdrc_actim *sdrc_actim_base;
+
+	if (cs)
+		sdrc_actim_base = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE;
+	else
+		sdrc_actim_base = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE;
+
+	if (early) {
+		/* reset sdrc controller */
+		writel(SOFTRESET, &sdrc_base->sysconfig);
+		wait_on_value(RESETDONE, RESETDONE, &sdrc_base->status,
+			      12000000);
+		writel(0, &sdrc_base->sysconfig);
+
+		/* setup sdrc to ball mux */
+		writel(SDRC_SHARING, &sdrc_base->sharing);
+
+		/* Disable Power Down of CKE cuz of 1 CKE on combo part */
+		writel(WAKEUPPROC | PWDNEN | SRFRONRESET | PAGEPOLICY_HIGH,
+				&sdrc_base->power);
+
+		writel(ENADLL | DLLPHASE_90, &sdrc_base->dlla_ctrl);
+		sdelay(0x20000);
+	}
+
+	writel(RASWIDTH_13BITS | CASWIDTH_10BITS | ADDRMUXLEGACY |
+		RAMSIZE_128 | BANKALLOCATION | B32NOT16 | B32NOT16 |
+		DEEPPD | DDR_SDRAM, &sdrc_base->cs[cs].mcfg);
+	writel(ARCV | ARE_ARCV_1, &sdrc_base->cs[cs].rfr_ctrl);
+	writel(V_ACTIMA_165, &sdrc_actim_base->ctrla);
+	writel(V_ACTIMB_165, &sdrc_actim_base->ctrlb);
+
+	writel(CMD_NOP, &sdrc_base->cs[cs].manual);
+	writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual);
+	writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
+	writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual);
+
+	/*
+	 * CAS latency 3, Write Burst = Read Burst, Serial Mode,
+	 * Burst length = 4
+	 */
+	writel(CASL3 | BURSTLENGTH4, &sdrc_base->cs[cs].mr);
+
+	if (!mem_ok(cs))
+		writel(0, &sdrc_base->cs[cs].mcfg);
+}
+
+/**
+ * dram_init - Sets uboots idea of sdram size
+ */
+int dram_init(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	unsigned int size0 = 0, size1 = 0;
+
+	size0 = get_sdr_cs_size(CS0);
+	/*
+	 * If a second bank of DDR is attached to CS1 this is
+	 * where it can be started.  Early init code will init
+	 * memory on CS0.
+	 */
+	if ((sysinfo.mtype == DDR_COMBO) || (sysinfo.mtype == DDR_STACKED)) {
+		do_sdrc_init(CS1, NOT_EARLY);
+		make_cs1_contiguous();
+
+		size1 = get_sdr_cs_size(CS1);
+	}
+
+	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
+	gd->bd->bi_dram[0].size = size0;
+	gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
+	gd->bd->bi_dram[1].size = size1;
+
+	return 0;
+}
+
+/**
+ * mem_init() - init the sdrc chip selects CS0 and CS1
+ *  - early init routines, called from flash or SRAM.
+ */
+void mem_init(void)
+{
+	/* only init up first bank here */
+	do_sdrc_init(CS0, EARLY_INIT);
+}
diff --git a/cpu/arm_cortexa8/omap3/sys_info.c b/cpu/arm_cortexa8/omap3/sys_info.c
index 08fb32e..1458b89 100644
--- a/cpu/arm_cortexa8/omap3/sys_info.c
+++ b/cpu/arm_cortexa8/omap3/sys_info.c
@@ -32,7 +32,7 @@
 #include <i2c.h>

 extern omap3_sysinfo sysinfo;
-static struct sdrc *sdrc_base = (struct sdrc *)OMAP34XX_SDRC_BASE;
+
 static struct ctrl *ctrl_base = (struct ctrl *)OMAP34XX_CTRL_BASE;
 static char *rev_s[CPU_3XX_MAX_REV] = {
 				"1.0",
@@ -104,46 +104,6 @@ u32 get_cpu_rev(void)
 	}
 }

-/****************************************************
- * is_mem_sdr() - return 1 if mem type in use is SDR
- ****************************************************/
-u32 is_mem_sdr(void)
-{
-	if (readl(&sdrc_base->cs[CS0].mr) == SDRC_MR_0_SDR)
-		return 1;
-	return 0;
-}
-
-/***********************************************************************
- * get_cs0_size() - get size of chip select 0/1
- ************************************************************************/
-u32 get_sdr_cs_size(u32 cs)
-{
-	u32 size;
-
-	/* get ram size field */
-	size = readl(&sdrc_base->cs[cs].mcfg) >> 8;
-	size &= 0x3FF;		/* remove unwanted bits */
-	size <<= 21;		/* multiply by 2 MiB to find size in MB */
-	return size;
-}
-
-/***********************************************************************
- * get_sdr_cs_offset() - get offset of cs from cs0 start
- ************************************************************************/
-u32 get_sdr_cs_offset(u32 cs)
-{
-	u32 offset;
-
-	if (!cs)
-		return 0;
-
-	offset = readl(&sdrc_base->cs_cfg);
-	offset = (offset & 15) << 27 | (offset & 0x30) >> 17;
-
-	return offset;
-}
-
 /***************************************************************************
  *  get_gpmc0_base() - Return current address hardware will be
  *     fetching from. The below effectively gives what is correct, its a bit
diff --git a/include/asm-arm/arch-omap3/mem.h b/include/asm-arm/arch-omap3/mem.h
index 9439758..0f3733f 100644
--- a/include/asm-arm/arch-omap3/mem.h
+++ b/include/asm-arm/arch-omap3/mem.h
@@ -270,4 +270,18 @@ enum {
 #define PISMO1_ONEN_BASE	ONENAND_MAP
 #define DBG_MPDB_BASE		DEBUG_BASE

+#ifndef __ASSEMBLY__
+/*
+ * Function prototypes
+ */
+void mem_init(void);
+
+u32 is_mem_sdr(void);
+u32 mem_ok(u32 cs);
+
+u32 get_sdr_cs_size(u32);
+u32 get_sdr_cs_offset(u32);
+
+#endif /* __ASSEMBLY__ */
+
 #endif /* endif _MEM_H_ */
diff --git a/include/asm-arm/arch-omap3/sys_proto.h b/include/asm-arm/arch-omap3/sys_proto.h
index 34bd515..34e4e0d 100644
--- a/include/asm-arm/arch-omap3/sys_proto.h
+++ b/include/asm-arm/arch-omap3/sys_proto.h
@@ -31,8 +31,10 @@ void prcm_init(void);
 void per_clocks_enable(void);

 void memif_init(void);
+#if defined(CONFIG_SDRC)
 void sdrc_init(void);
 void do_sdrc_init(u32, u32);
+#endif
 void gpmc_init(void);
 void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base,
 			u32 size);
@@ -46,8 +48,6 @@ u32 get_sysboot_value(void);
 u32 is_gpmc_muxed(void);
 u32 get_gpmc0_type(void);
 u32 get_gpmc0_width(void);
-u32 get_sdr_cs_size(u32);
-u32 get_sdr_cs_offset(u32);
 u32 is_running_in_sdram(void);
 u32 is_running_in_sram(void);
 u32 is_running_in_flash(void);
diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
index a8abb0e..eeeb324 100644
--- a/include/configs/omap3_beagle.h
+++ b/include/configs/omap3_beagle.h
@@ -37,6 +37,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_BEAGLE	1	/* working with BEAGLE */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>		/* get chip and board defs */
 #include <asm/arch/omap3.h>

diff --git a/include/configs/omap3_evm.h b/include/configs/omap3_evm.h
index 52cb202..72b2f72 100644
--- a/include/configs/omap3_evm.h
+++ b/include/configs/omap3_evm.h
@@ -42,6 +42,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_EVM	1	/* working with EVM */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>	/* get chip and board defs */
 #include <asm/arch/omap3.h>

diff --git a/include/configs/omap3_overo.h b/include/configs/omap3_overo.h
index c72fb9d..d36b8f7 100644
--- a/include/configs/omap3_overo.h
+++ b/include/configs/omap3_overo.h
@@ -29,6 +29,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_OVERO	1	/* working with overo */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>	/* get chip and board defs */
 #include <asm/arch/omap3.h>

diff --git a/include/configs/omap3_pandora.h b/include/configs/omap3_pandora.h
index f22fab5..f323d76 100644
--- a/include/configs/omap3_pandora.h
+++ b/include/configs/omap3_pandora.h
@@ -32,6 +32,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_PANDORA	1	/* working with pandora */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>	/* get chip and board defs */
 #include <asm/arch/omap3.h>

diff --git a/include/configs/omap3_sdp3430.h b/include/configs/omap3_sdp3430.h
index 4d01933..ce20c9f 100644
--- a/include/configs/omap3_sdp3430.h
+++ b/include/configs/omap3_sdp3430.h
@@ -42,6 +42,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_3430SDP	1	/* working with SDP Rev2 */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>		/* get chip and board defs */
 #include <asm/arch/omap3.h>

diff --git a/include/configs/omap3_zoom1.h b/include/configs/omap3_zoom1.h
index cdf95c0..22aca38 100644
--- a/include/configs/omap3_zoom1.h
+++ b/include/configs/omap3_zoom1.h
@@ -38,6 +38,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_ZOOM1	1	/* working with Zoom MDK Rev1 */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>		/* get chip and board defs */
 #include <asm/arch/omap3.h>

diff --git a/include/configs/omap3_zoom2.h b/include/configs/omap3_zoom2.h
index 7a8beb8..49bf72f 100644
--- a/include/configs/omap3_zoom2.h
+++ b/include/configs/omap3_zoom2.h
@@ -39,6 +39,8 @@
 #define CONFIG_OMAP3430		1	/* which is in a 3430 */
 #define CONFIG_OMAP3_ZOOM2	1	/* working with Zoom II */

+#define CONFIG_SDRC		1	/* The chip has SDRC controller */
+
 #include <asm/arch/cpu.h>	/* get chip and board defs */
 #include <asm/arch/omap3.h>

--
1.6.2.4



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