On Friday 11 February 2005 00.11, Wolfgang Denk wrote:
In message OF148F35BA.97D68C7A-ON07256FA4.007D54A4@mck.us.ray.com you
wrote:
- Is there a way to use U-boot without an EEPROM. Can we use U-b oot
with
U-Boot does not need any EEPROM at all.
Ummm... maybe you meant flash memory when you wrote EEPROM?
Even then, U-Boot does not need any flash at all, either. [Although it makes some things much easier.]
its environmental variables on the Compactflash card?
Short answer: no, this is not possible.
In the current code there is no support for storing the environment in CF; adding this feature is non trivial and not possible withouit major reorganization of the U-Boot code.
Remember that the environment must be accessable very early, even before the system RAM has been initialized, i. e. in a very restricted environment with just a minimal stack, no writable data segment, etc. Compact Flash (or more generally: IDE) support is enabled much, much later in the boot sequence.
Shouldn't it be possible to do this in two stages. 1) Have environment variables in flash/EEPROM so you can mount the CF disk 2) Run an autoscript(?) from that disk to change the variables (do not save) 3) Boot
/RogerL