|To:||Ralf Baechle <firstname.lastname@example.org>|
|Subject:||Re: Can you add a signature to the kernel ELF image?|
|From:||Adam Nielsen <email@example.com>|
|Date:||Wed, 25 Nov 2009 21:34:50 +1000|
|User-agent:||Mozilla/5.0 (X11; U; Linux x86_64; en-GB; rv:22.214.171.124) Gecko/20090809 Thunderbird/126.96.36.199 Mnenhy/0.7.5.0|
Take a look at arch/mips/kernel/head.S. This file will be the first on the final linker call's command line, that is head.S's .text section will end at the lowest address.
Ah excellent, that combined with the linker script (to twiddle load addresses) is just what I'm after.
#ifdef CONFIG_NCD_HMX b 1f nop nop .word 0x20 .asciz "XncdHMX" .word 0, 0, 0 #endif
Perfect, thanks for the example, that makes it much easier.
The wiki page says something about a CRC but just poking a 0x20 into a constant address is not exactly a CRC calculation. Not sure how this really is meant.
As far as I'm aware 0x20 means "ignore the CRC", I think the CRC itself is covered by one of the zero words.
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