u-boot-1.1.6里面默认配置文件里面支持的nor型号是
1 #if 0
2 #define CONFIG_AMD_LV400 1 /* uncomment this if you have a LV400 flash */
3 #endif
4 #define CONFIG_AMD_LV800 1 /* uncomment this if you have a LV800 flash */
而我们使用的nor flash不是LV400/LV800;
我们使用的芯片是MX29LV160DB,但是uboot里面没有,而有相近的AM29LV040B,这是需要借助数据手册仿写一个
MX29LV160DB特性有:
大小:2M
位数:16位
扇区数目:4个
已经有的配置: 在jedec_flash.c里面
{
.mfr_id = (u16)AMD_MANUFACT,
.dev_id = AM29LV040B,
.name = "AMD AM29LV040B",
.uaddr = {
[0] = MTD_UADDR_0x0555_0x02AA /* x8 */
},
.DevSize = SIZE_512KiB,
.CmdSet = P_ID_AMD_STD,
.NumEraseRegions= 1,
.regions = {
ERASEINFO(0x10000,8),
}
}
以上各种参数说明:
struct amd_flash_info {
const __u16 mfr_id;
const __u16 dev_id;
const char *name;
const int DevSize;
const int NumEraseRegions;
const int CmdSet;
const __u8 uaddr[4]; /* unlock addrs for 8, 16, 32, 64 */
const ulong regions[6];
};
我们修改为:
1 {
2 .mfr_id = MANUFACTURER_AMD, //制造商
3 .dev_id = AM29LV160DB, //型号
4 .name = "AMD AM29LV160DB", //名字
5 .uaddr = {
6 [0] = MTD_UADDR_0x0AAA_0x0555, /* x8 */
7 [1] = MTD_UADDR_0x0555_0x02AA /* x16 */ 输出对应指令,翻阅数据手册
8 },
9 .DevSize = SIZE_2MiB, //大小
10 .CmdSet = P_ID_AMD_STD,
11 .NumEraseRegions= 4, //分区数目
12 .regions = { //分区列表,参看nor数据手册
13 ERASEINFO(0x04000,1),
14 ERASEINFO(0x02000,2),
15 ERASEINFO(0x08000,1),
16 ERASEINFO(0x10000,31)
17 }
18 }
现在回顾nor flash的调用过程:
board.c里面调用flash_init ();
flash_init ();
cfi_flash.c //注意,正常情形使用flash.c,不过因为flash.c里面没有我们需要的型号,所以应该在flash.c所在目录下的Makefile里面去掉flash.o
flash_detect_legacy
flash_read_jedec_ids //制造商
jedec_flash_match
jedec_table //在芯片table里面匹配有无支持的NOR flash
flash_get_size
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