于16年2月多购买了tiny4412sdk-1506，用友善之臂（以下简称友善）的superboot是可以进入linux，而用三星原始的uboot_tiny4412-20130729则不可以。出现现象是卡在“OK”，
偶尔能继续跑下去。根据以往开发的经验，可以知道这绝对是ddr3配置的问题，查看“Tiny4412-1306-Schematic”是4颗[email protected]，用到一个控制器两个片选(chip0,chip1)，而“Tiny
4412-1412-Schematic”（对应我购买的PCB）是2颗[email protected]，只需要一个控制器一个片选(chip0)。
(1306版本最好是两个控制器一个片选，能把ddr3带宽提升到64bit，可能技术/成本原因没实现)
以下是我做的补丁包，代码如下：
diff -uNrp uboot_tiny4412/board/samsung/tiny4412/mem_init_tiny4412.S uboot_tiny4412_kevin/board/samsung/tiny4412/mem_init_tiny4412.S
--- uboot_tiny4412/board/samsung/tiny4412/mem_init_tiny4412.S 2016-04-11 12:32:03.511480729 +0800
+++ uboot_tiny4412_kevin/board/samsung/tiny4412/mem_init_tiny4412.S 2016-04-01 01:39:09.950628589 +0800
@@ -67,12 +67,12 @@ mem_ctrl_asm_init:
ldr r1, =0x0FFF301A
str r1, [r0, #DMC_CONCONTROL]
- ldr r1, =0x00312640
+ ldr r1, =0x00302640 @这里只有一个chip0
str r1, [r0, #DMC_MEMCONTROL]
- ldr r1, =0x40e01323
+ ldr r1, =0x40C01333 @Row是15bit，偏移地址是0x3FFFFFFF(1GB)
str r1, [r0, #DMC_MEMCONFIG0]
- ldr r1, =0x60e01323
+ ldr r1, =0x80C01333 @可以不修改，这里只为了说明控制器0地址到达0x7FFFFFFF
str r1, [r0, #DMC_MEMCONFIG1]
#ifdef CONFIG_IV_SIZE
@@ -97,11 +97,11 @@ mem_ctrl_asm_init:
str r1, [r0, #DMC_TIMINGPOWER]
#endif
#ifdef MCLK_400
- ldr r1, =0x4046654f
+ ldr r1, =0x6946654f @根据ddr3颗粒规格书微调参数
str r1, [r0, #DMC_TIMINGROW] @TimingRow
- ldr r1, =0x46400506
+ ldr r1, =0x46460506 @根据ddr3颗粒规格书微调参数
str r1, [r0, #DMC_TIMINGDATA] @TimingData
- ldr r1, =0x52000a3c
+ ldr r1, =0x5200183c @根据ddr3颗粒规格书微调参数
str r1, [r0, #DMC_TIMINGPOWER] @TimingPower
#endif
@@ -133,7 +133,7 @@ mem_ctrl_asm_init:
4: subs r2, r2, #1
bne 4b
-#if 1
+#if 0 @去掉chip1代码
/* chip 1 */
ldr r1, =0x07100000
str r1, [r0, #DMC_DIRECTCMD]
@@ -209,12 +209,12 @@ mem_ctrl_asm_init:
ldr r1, =0x0FFF301A
str r1, [r0, #DMC_CONCONTROL]
- ldr r1, =0x00312640
+ ldr r1, =0x00302640
str r1, [r0, #DMC_MEMCONTROL]
- ldr r1, =0x40e01323 @Interleaved?
+ ldr r1, =0x40c01333 @Interleaved?
str r1, [r0, #DMC_MEMCONFIG0]
- ldr r1, =0x60e01323
+ ldr r1, =0x80C01323
str r1, [r0, #DMC_MEMCONFIG1]
#ifdef CONFIG_IV_SIZE
@@ -239,11 +239,11 @@ mem_ctrl_asm_init:
str r1, [r0, #DMC_TIMINGPOWER]
#endif
#ifdef MCLK_400
- ldr r1, =0x4046654f
+ ldr r1, =0x6946654f @根据ddr3颗粒规格书微调参数
str r1, [r0, #DMC_TIMINGROW] @TimingRow
- ldr r1, =0x46400506
+ ldr r1, =0x46460506 @根据ddr3颗粒规格书微调参数
str r1, [r0, #DMC_TIMINGDATA] @TimingData
- ldr r1, =0x52000a3c
+ ldr r1, =0x5200183c @根据ddr3颗粒规格书微调参数
str r1, [r0, #DMC_TIMINGPOWER] @TimingPower
#endif
@@ -275,7 +275,7 @@ mem_ctrl_asm_init:
4: subs r2, r2, #1
bne 4b
-#if 1
+#if 0 @去掉chip1代码
/* chip 1 */
ldr r1, =0x07100000
str r1, [r0, #DMC_DIRECTCMD]
diff -uNrp uboot_tiny4412/board/samsung/tiny4412/tiny4412.c uboot_tiny4412_kevin/board/samsung/tiny4412/tiny4412.c
--- uboot_tiny4412/board/samsung/tiny4412/tiny4412.c 2016-04-11 12:32:03.511480729 +0800
+++ uboot_tiny4412_kevin/board/samsung/tiny4412/tiny4412.c 2016-03-29 21:37:21.071493254 +0800
@@ -195,6 +195,14 @@ void dram_init_banksize(void)
gd->bd->bi_dram[2].size = PHYS_SDRAM_3_SIZE;
gd->bd->bi_dram[3].start = PHYS_SDRAM_4;
gd->bd->bi_dram[3].size = PHYS_SDRAM_4_SIZE;
+ gd->bd->bi_dram[4].start = PHYS_SDRAM_5; //BANK数量改变
+ gd->bd->bi_dram[4].size = PHYS_SDRAM_5_SIZE;
+ gd->bd->bi_dram[5].start = PHYS_SDRAM_6;
+ gd->bd->bi_dram[5].size = PHYS_SDRAM_6_SIZE;
+ gd->bd->bi_dram[6].start = PHYS_SDRAM_7;
+ gd->bd->bi_dram[6].size = PHYS_SDRAM_7_SIZE;
+ gd->bd->bi_dram[7].start = PHYS_SDRAM_8;
+ gd->bd->bi_dram[7].size = PHYS_SDRAM_8_SIZE;
#ifdef CONFIG_TRUSTZONE
gd->bd->bi_dram[nr_dram_banks - 1].size -= CONFIG_TRUSTZONE_RESERVED_DRAM;
diff -uNrp uboot_tiny4412/drivers/mmc/mmc.c uboot_tiny4412_kevin/drivers/mmc/mmc.c
--- uboot_tiny4412/drivers/mmc/mmc.c 2016-04-11 12:32:04.479480708 +0800
+++ uboot_tiny4412_kevin/drivers/mmc/mmc.c 2016-03-30 01:03:42.119732762 +0800
@@ -955,7 +955,7 @@ static int mmc_read_ext_csd(struct mmc *
ext_csd_struct = ext_csd[EXT_CSD_REV];
host->ext_csd.boot_size_multi = ext_csd[BOOT_SIZE_MULTI];
- if (ext_csd_struct > 5) {
+ if (ext_csd_struct > 7) { //若不修改，进入uboot会提示无法识别版本，原因是友善用的emmc颗粒版本较高
printf("unrecognised EXT_CSD structure "
"version %d\n", ext_csd_struct);
err = -1;
diff -uNrp uboot_tiny4412/include/configs/tiny4412.h uboot_tiny4412_kevin/include/configs/tiny4412.h
--- uboot_tiny4412/include/configs/tiny4412.h 2016-04-11 20:37:03.834845777 +0800
+++ uboot_tiny4412_kevin/include/configs/tiny4412.h 2016-04-11 16:13:01.719191442 +0800
@@ -278,9 +278,9 @@
#ifdef CONFIG_EVT0_STABLE
#define CONFIG_NR_DRAM_BANKS 2
#else
-#define CONFIG_NR_DRAM_BANKS 4
+#define CONFIG_NR_DRAM_BANKS 8 //BANK提高到8
#endif
-#define SDRAM_BANK_SIZE 0x10000000 /* 256 MB */
+#define SDRAM_BANK_SIZE 0x08000000 /* 128 MB */ //每个BANK容量减小
#define PHYS_SDRAM_1 CONFIG_SYS_SDRAM_BASE /* SDRAM Bank #1 */
#define PHYS_SDRAM_1_SIZE SDRAM_BANK_SIZE
#define PHYS_SDRAM_2 (CONFIG_SYS_SDRAM_BASE + SDRAM_BANK_SIZE) /* SDRAM Bank #2 */
@@ -326,7 +326,7 @@
*/
/* Fastboot variables */
#define CFG_FASTBOOT_TRANSFER_BUFFER (0x48000000)
-#define CFG_FASTBOOT_TRANSFER_BUFFER_SIZE (0x18000000) /* 384MB */
+#define CFG_FASTBOOT_TRANSFER_BUFFER_SIZE (0x30000000) /* 768MB */ //当初为了调原生uboot启动android5.0修改，这里跟uboot启动无关
#define CFG_FASTBOOT_ADDR_KERNEL (0x40008000)
#define CFG_FASTBOOT_ADDR_RAMDISK (0x41000000)
#define CFG_FASTBOOT_PAGESIZE (2048) // Page size of booting device
以上的注释都是patch之后后续加上，只为了方便阅读。修改后的uboot启动android 4.2是可以正常启动，但无法运行android 5.0（启动一段时间后自动跑飞），问了其他人均表示此现象。
询问友善说是uboot问题。应该是superboot做了其他处理，这里没有能力继续研究下去。
1：友善的售后做的很差，把客户当傻X；
2：开源力度相当低；
3：硬件&PCB设计很差。
以上三点理由让我不会再选择友善的产品！
时间： 2025-01-25 07:55:18