On 10/18/2012 10:59 PM, Khalid Aziz wrote: > On Thu, 2012-10-18 at 11:12 +0800, Dave Young wrote: >> On 09/12/2012 10:35 AM, Dave Young wrote: >> >>> On 09/07/2012 04:56 PM, Dave Young wrote: >>>> >>>> I did some digging about the efi boot kdump in slackware with kernel >>>> from latest linus tree. I'm surprise that kdump works even without these >>>> "noefi" and "acpi_rsdp=" >>>> >>>> With fedora 17 3.4.3 kernel passing "acpi_rsdp=" is enough for kdump >>>> kernel booting. >>>> >>>> Actually in x86 setup code if bootloader do not pass correct efi_info in >>>> boot_params efi_enabled will be set to 0 automaticlly. >>>> >>>> So as for this patch 'noefi' is not needed. >>>> >>>> I will do more testing to see why linus tree works without "acpi_rsdp=" >>>> >>> >>> There's probably some efi changes between 3.4.3 - 3.6.0-rc4 cause this >>> works. I have not got time to bisect it. >> >> >> During recent test, I found I mistakenly used wrong kernel config >> without CONFIG_EFI in 1st kernel for testing. acpi_rsdp= is still needed. >> >> Just resent the v2 patch, please help to review. >> > > Hi Dave, > > I suspect EFI based systems with Compatibility Support Module (CSM) are > still not going to need this, but I can see native EFI systems with no > CSM needing this. I have reviewed your patch. Good to know, I have no CSM machine to test. Since Simon has applied the patch, I think I can improve this issue later If I can find a machine with CSM. > > BTW, I am no longer at HP, so <khalid.aziz at hp.com> is no longer valid. > <khalid at gonehiking.org> is my permanent personal email address. Thanks for reminding. > > -- > Khalid > > > _______________________________________________ > kexec mailing list > kexec at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec -- Thanks Dave
