[U-Boot-Users] Re: [PATCH] Make System IO Config Registers board configurable on MPC83xx

[David Updegraff <dave@cray.com>]

Wolfgang.

That is very  convincing. So for the special case of setting RCW to boot 
from lowmem vector, all is well.  And I guess there is no great harm in 
that restriction.

When RCW set to boot from himem vector though, the 83xx maps in the 
_last_ 8M of the flash chip, not the first, so the remap_flash_by_law* 
routines end up mapping u-boot out from under us.  But OK; we just won't 
do that then.

I still stand by by compaint though: if you're going to remap flash 
according to CFG_FLASH_BASE in start.S,  then the 8M hardcoded size is 
annoying.

>>back to LAW0 on a builtin assumption of 8M size, placing the starting 
>>address thereof to the CFG_FLASH_BASE location (in their case, 
>>0xfe00_0000); then do jumping arithmetic based on that value and TEXT_BASE.
>>
>>Which works in the Freescale-ADS case, as they have an 8M flash chip.
> 
> 
> It also works in case of the TQM8349 board, which uses 32 MB:
> 
> U-Boot 1.1.4 (Nov 17 2005 - 00:14:36) MPC83XX
> 
> Clock configuration:
>   Coherent System Bus:  266 MHz
>   Core:                 533 MHz
>   Local Bus:             33 MHz
> CPU:   MPC83xx, Rev: 1.1 at 533.328 MHz
> Board: TQM834x
> PCI1:  32 bit, 33 MHz
> I2C:   ready
> DTT:   1 is 28 C
> DRAM:  256 MB
> FLASH: 32 MB
> PCI:   Bus Dev VenId DevId Class Int
> In:    serial
> Out:   serial
> Err:   serial
> Net:   TSEC0, TSEC1
> 
> Type "run flash_nfs" to mount root filesystem over NFS
> 
> Hit any key to stop autoboot:  0 
> => fli
> 
> Bank # 1: CFI conformant FLASH (32 x 16)  Size: 32 MB in 256 Sectors
>  Erase timeout 16384 ms, write timeout 0 ms, buffer write timeout 4096 ms, buffer size 32
>   Sector Start Addresses:
>     80000000 (RO) 80020000 (RO) 80040000 (RO) 80060000      80080000     
>     800A0000      800C0000      800E0000      80100000      80120000     
>     80140000      80160000      80180000      801A0000      801C0000     
> ...
> 
> Best regards,
> 
> Wolfgang Denk
>