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	solca	2009-01-21 , 22:24
	Posts: 109 \| Thanked: 196 times \| Joined on Sep 2008 @ Guatemala	#43

Originally Posted by daperl

I realize this isn't a solution, but can you document what you did here. This is great progress and there's an outside chance that I could help. Thanks.

You need to compile your kernel with CONFIG_BOOT_PRINTK_DELAY set and pass the boot parameter 'boot_delay=X' where X is ms. I pass 100ms and it works without the need for serial-console R&D flag. Please keep us posted on your findings.

Originally Posted by fanoush

so 2.6.21 from latest Diablo is old or recent regarding this serial code? I guess still the old one. I forgot you run recent kernels so the one doing the kexec for you was not the old one. I'm trying this with 2.6.21.

I see. What about delay just before jumping to new kernel or what about switching to slower CPU clock before?

I tried to kexec the 2.6.21 kernel from a kexec capable 2.6.28 and it only works with serial-console flag. On the other side a 2.6.28 kexeced kernel works without serial-console flag iff you insert the above printk delays. I didn't tried a 2.6.21 kernel with delays tho.

BTW I have not tried to insert delays before jumping nor switching to slower CPU freqs as I'm not a very bright kernel hacker

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