Wolfgang Denk wrote:
In message 42D2DC59.6090507@ntlworld.com you wrote:
Is there a driver that supports this flash within U-Boot? I can't see one, but want to make sure I didn't miss it before I reinvent the wheel!
There are several. First, there is the general CFI driver, and then there are several board specific drivers like board/tqm8260/flash.c
I have tried both of the suggested drivers with neither working for me.
I have spent more time looking at the tqm8260/flash.c and have managed to make some improvements. Initially it was unable to even read back the device type but I noticed that if I single stepped (using JTAG) the flash_get_size() function then it _was_ able to correctly read the device type.
This sounded like a timing issue until someone suggested that between the writes and reads I should have "sync" and/or "eieio" to ensure the CPU (MPC7400) does not execute them out of sequence. This certainly fixed the flash_get_size() function, but I am still unable to write to the flash (eg using saveenv). Though again I do see some data written if I am single-stepping the write_dword() function.
Reading data from the flash works just fine.
Any suggestions?
Thanks Rich