[U-Boot-Users] AM29LV160DT (top boot block and CFI)

[Cliff Brake]

Hello.

I'm using the AM29LV160DT (top boot block) with the u-boot CFI flash
driver.  It seems that U-boot thinks this is a bottom boot block
device:

flinfo:

Bank # 1: CFI conformant FLASH (16 x 16)  Size: 2 MB in 35 Sectors
 Erase timeout 16384 ms, write timeout 0 ms, buffer write timeout 1
ms, buffer size 1
  Sector Start Addresses:
    B8000000      B8004000      B8006000      B8008000      B8010000
    B8020000      B8030000      B8040000      B8050000      B8060000
    B8070000      B8080000      B8090000      B80A0000      B80B0000
    B80C0000      B80D0000      B80E0000      B80F0000      B8100000
    B8110000      B8120000      B8130000      B8140000      B8150000
    B8160000      B8170000      B8180000      B8190000      B81A0000
    B81B0000      B81C0000      B81D0000      B81E0000      B81F0000

Note the boot sectors are appearing at the bottom of the device
instead of the top.

There is a note in the CFI specification that states:

1. Erase Blocks always start at address 0 of the Bottom Boot or
Uniform Low Version of the
Flash Device

So I assume, the CFI information in the device is correct and it must
be swapped if you have a top boot block device.  If this is true, the
sector information needs to be reversed after the device is scanned. 
Unfortunately, the CFI data for this device does not include
top/bottom boot info.  The only other information I have found to key
off of is the device ID.

Has anyone else run into this problem and is there a better solution
than keying off the device ID and then reversing the sector info?

Thanks,
Cliff

--
=======================
Cliff Brake
http://bec-systems.com