[U-Boot-Users] Offset beginning of flash image?
Timothy Canham
Timothy.Canham at jpl.nasa.gov
Fri Jan 17 23:32:54 CET 2003
The problem is that PPCBoot doesn't support the rsh method of booting
kernels, so we are stuck w/ tftpboot. We can't use that for our vxworks
kernels.
Wolfgang Denk wrote:
>In message <3E2873F9.5050107 at jpl.nasa.gov> you wrote:
>
>
>>I am trying to load two boot loaders on to the flash at once. We want to
>>put the vxworks bootloader first, then jump to the beginning of the
>>ppcboot loader at a higher address in the flash when we need to. What
>>
>>
>
>This will not work. PPCBoot / U-Boot expect to find a "virgin"
>system, i. e. to be started from the reset entry point.
>
>
>I don't say it can't be done, but you have to understand exactly how
>the initialization sequence works, and what already has been done by
>your other boot loader.
>
>
>I recommend to use just U-Boot, and dump the VxWorks bootloader.
>U-Boot can boot VxWorks fine, too.
>
>
>Best regards,
>
>Wolfgang Denk
>
>
>
--
Timothy K. Canham
Jet Propulsion Laboratory
Pasadena, CA
Timothy.Canham at jpl.nasa.gov
MDS Flight Software
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