[U-Boot-Users] RFC: U-Boot Environment support in SystemAce Compact FLASH

[Keith J Outwater]

Hello all - 
I have completed the initial port of U-Boot to a custom PPC405/VirtexII 
Pro FPGA board and I am starting to look at ways to store the U-Boot 
environment in the CF card used for FPGA configuration by the Xilinx 
SystemAce.
As it stands now, there is DOS FAT read support in U-Boot but no write 
support, so that would have to be added if the environment was to be 
stored as a DOS file on the CF card.  Another option might be to partition 
the CF card so as to leave a few sectors unused and use low-level sector 
read/write routines to store the environment directly to the CF card. This 
solution seems straightforward, but seems somehow inelegant.
I am leaning toward the approach of adding DOS FAT write support and 
adjusting the initial U-Boot environment to provide sufficient stack space 
to run the DOS filesystem code during initial boot.  Does this seem 
reasonable?  Does anyone know where the original DOS filesystem code came 
from? 

Keith