bbb sd6 无e2 修改

1. u-boot修改

board/ti/am335x/board.c

void s_init(void)和static int read_eeprom(void)这两个函数要从e2中读取数据，只需要把原版的bbb的e2中的数据读出来并添充到相应的数据结构里即可。

最终是要填充这个结构体

struct am335x_baseboard_id {
unsigned int magic;
char name[HDR_NAME_LEN];
char version[4];
char serial[12];
char config[32];
char mac_addr[HDR_NO_OF_MAC_ADDR][HDR_ETH_ALEN];
};

先在原版的板子上打印这个结构体数据

int i = 0;
uchar *tmp = (uchar *)&header; //header即为am335x_baseboard_id的变量
for(i = 0; i < sizeof(header); i++)
{
if(i%10 == 0)
printf("\n");
printf("%x ", *tmp);
tmp++;
}

数据如下：

unsigned char e2_data[80] = {0xaa, 0x55, 0x33, 0xee, 0x41, 0x33, 0x33, 0x35, 0x42, 0x4e,
0x4c, 0x54, 0x30, 0x30, 0x41, 0x35, 0x35, 0x30, 0x30, 0x34,
0x42, 0x42, 0x42, 0x4b, 0x32, 0x37, 0x35, 0x30, 0x58, 0x41,
0x58, 0x58, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x30, 0x31,
0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41, 0x42,
0x43, 0x44, 0x45, 0x46, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

然后，在代码里填充这个结构体即可

int i = 0;
uchar *tmp = (uchar *)&header;
for(i = 0; i < sizeof(header); i++)
{
tmp[i] = e2_data[i];
}

然后修改代码，找不到和读不到e2时，别让程序return就可以了

2. kernel修改

arch/arm/mach-omap2/board-am335xevm.c

static void am335x_evm_setup(struct memory_accessor *mem_acc, void *context)

修改以下两个地方即可

if (ret != sizeof(am335x_mac_addr)) {
pr_warning("AM335X: EVM Config read fail: %d\n", ret);
//return;
memcpy(am335x_mac_addr, e2_data + EEPROM_MAC_ADDRESS_OFFSET, sizeof(am335x_mac_addr));
}

if (ret != sizeof(config)) {
pr_err("AM335X EVM config read fail, read %d bytes\n", ret);
pr_err("This likely means that there either is no/or a failed EEPROM\n");
//goto out;
memcpy((char *)&config, e2_data, sizeof(config));
}