[U-Boot-Users] OS dependencies on the bootloader
wd at denx.de
Wed Jan 4 23:30:02 CET 2006
In message <43BC4A51.9050203 at mc.com> you wrote:
> A general bootloader question: How much hardware initialization should a
> bootloader perform for the target OS?
As little as possible, as much as necessary.
> I see a minimal memory controller setup to allow subsequent loading of
> an OS image. ECC might also be setup but all remaining resources would
> typically be setup by the OS.
> Although I haven't tried booting Linux (we boot the vxworks bootrom),
> does an embedded Linux make any assumptions about what the bootloader
Yes. Depending on architecture and kernel versions certain parameters
(ATAGs, bd_info structure, OF tree, whatever) have to be initialized
and passed to the kernel.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Digital computers are themselves more complex than most things people
build: They have very large numbers of states. This makes conceiving,
describing, and testing them hard. Software systems have orders-of-
magnitude more states than computers do. - Fred Brooks, Jr.
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