The part of code I given out is in my get_flash_size() function in my flash.c. This part of code is used to read out the Manufacture ID and Device ID of my nor flash. This maybe have no contribution to the source tree, but maybe others that having the same problem can get a clue for such problems.
2009/11/26 Wolfgang Denk wd@denx.de
Dear Peter Pan,
In message 48abf2c20911251756k1ca3fe19p26db4a65b68bc366@mail.gmail.com you wrote:
I have checked this problem again, and find out the reason why sometimes we get a false value of the ID0 we read from norflash.
When we read IDs from norflash, we first write the read id command:
AMD_SEND_CMD(baseaddr, ACMD_READMODE); AMD_SEND_CMD((baseaddr | LATCH_OFFSET1), ACMD_UNLOCK1); AMD_SEND_CMD((baseaddr | LATCH_OFFSET2), ACMD_UNLOCK2); AMD_SEND_CMD((baseaddr | LATCH_OFFSET1), ACMD_ID);
then we read the IDs from norflash: pAddr = (unsigned short *)(baseaddr & 0xFFFFFF00); //Manufacture Id code0 = *(pAddr); //cycle 4: Addr: X00 data = 0x01 pAddr = (unsigned short *)(baseaddr + DEVICE_CODE1_OFFSET_2X16); code1 = *pAddr; //cycle 4: Addr: X01, X - don't care. data = 0x227E pAddr = (unsigned short *)(baseaddr + DEVICE_CODE2_OFFSET_2X16); code2 = *pAddr; //cycle 5: Addr: X0E data = 0x2223 pAddr = (unsigned short *)(baseaddr + DEVICE_CODE3_OFFSET_2X16); code3 = *(pAddr); //cycle 6: Addr: X0F data = 0x2201 AMD_SEND_CMD(baseaddr, ACMD_READMODE);
Umm.. could you please point out which specific part of code (i. e . file name and line numbers, or snippet of the real code from the source file) you are talking about here?
I have problems following you, as for example I can find no such thing as AMD_SEND_CMD or ACMD_READMODE or LATCH_OFFSET anywhere in the whole source tree ?
Best regards,
Wolfgang Denk
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