Messages in this thread | | | Date | Wed, 04 Oct 2006 13:27:49 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 12/12] i386 boot: Add an ELF header to bzImage |
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Vivek Goyal wrote: > > Eric/Peter, > > How about just extending bzImage format to include some info in real mode > kernel header. Say protocol version 2.05. I think if we just include two > more fields, is kernel relocatable and equivalent of ELF memsz, then probably > this information should be enough for kexec bzImage loader to load and run > a relocatable kernel from a different address. >
What would be the exact semantics of the "equivalent of ELF memsz"? I have balked on that one in the past, because the proposed semantics were unsafe.
I suspect we need at least one more piece of data, which is the required alignment of a relocated kernel. Either which way, it seems clear that there is some re-engineering that needs to be done, and I think we need to better understand *why* the proposed patch failed.
Can this failure be reproduced in a simulator?
-hpa
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