[U-Boot] [PATCH] ppc: Unlock cache-as-ram in a consistent manner

[Scott Wood]

Liu Dave-R63238 wrote:
>>> with this patch, this mpc8313 board does this:
>>>
>>> U-Boot 2009.06-00524-g28958b8 (Jul 23 2009 - 18:33:11) MPC83XX
>>>
>>> Reset Status:
>>>
>>> CPU:   e300c3, MPC8313E, Rev: 1.0 at 333.333 MHz, CSB: 166.667 MHz
>>> Board: Freescale MPC8313ERDB
>>> I2C:   ready
>>> DRAM:  128 MB
>>> FLASH: ## Unknown FLASH on Bank 1 - Size = 0x00000000 = 0 MB
>>> *** failed ***
>>> ### ERROR ### Please RESET the board ###
>>>
>>> and when reverted, it boots normally, so the board wants to 
>> agree that
>>> this patch is reverted.
>> Flash is mapped cacheable on 8313erdb (and some other 83xx 
>> boards) -- it
>> shares a BAT with the locked cache area.
> 
> Yes. Scott is right.
> The rootcause is the classic PPC has not enough BAT.

8313erdb has an unused BAT7 (not counting the ones that would normally 
be used for PCI2), and there are other 83xx boards that look like they 
get it right.

-Scott