In message cfqlq9$1d9$1@sea.gmane.org you wrote:
I have u-boot working on a custom board based on the MV64360 with a PPC 750GX processor. I've set the autoboot timeout to 3 secs, with the bootcmd to 'go 0x40004'. I have a 'serial_getc' in main_loop so that I can transfer a binary to the 40004 mem. location using a PCI interface via the host machine.
Ummm.. what _exactly_ are you doing? What has a "serial_getc in main_loop" to do with a PCI transfer to memory? and why do you have to do such modifications at all when all can be done using envrionment variables?
On timeout, u-boot tries to transfer control to the binary, but it seems there's some problem:
What exactly is the contents of the memory at 0x00040004 at this time? [and how can you be sure about this?]
Also, can this be due to some caching? It should not, 'cos there shouldn't have been any access to this location earlier for the data at that location to be cached, but one possibility that I can think of right now.
If there was no access to this location earlier, then how do you think this location could contain executable code?
Best regards,
Wolfgang Denk