On Feb 5, 2009, at 1:16 PM, Scott Coulter wrote:
Hi everyone,
I just wanted to share something that I discovered with our 8572-based board. The board's 4Mbyte flash is mapped starting at address 0xFFC00000. When moving to U-boot v2008-10, I discovered that I had lost the ability to erase the entire flash (in order to update the U-boot binary). After the erase operation, the flash device would contain the erased value, 0xFF, up to the address 0xFFFFF000 with non-FF data after that point. After some investigation, it appears that defining the macro CONFIG_MP was causing the issue. With CONFIG_MP not defined, the entire upper portion of flash could be verified as erased. My guess is that it has something to do with the start page for the secondary processor. Ultimately, the solution for me was to move the flash from 0xFFC00000 to 0xEFC00000 and all was well with CONFIG_MP defined.
Scott
This is correct. As the only 8572 board that exists in the u-boot tree is for the Freescale MPC8572DS I didn't query anyone else on possible impact of the change.
- k