[U-Boot] about ## Unknown FLASH on Bank 0

[Peter Pan]

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 at denx.de>

> Dear Peter Pan,
>
> In message <48abf2c20911251756k1ca3fe19p26db4a65b68bc366 at 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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>