On 08/13/2013 12:02 PM, James Bottomley wrote: > On Tue, 2013-08-13 at 11:52 -0700, H. Peter Anvin wrote: >> On 08/13/2013 11:43 AM, James Bottomley wrote: >>> Can we actually boot a 32 bit kernel on an EFI64 system? The last time >>> I tried on my Secure Boot SDV it wouldn't work; the problem is getting >>> someting in the transfer of control path to boot the processor back to >>> 32 bit mode. >> >> We can boot with a bootloader in "skip stub" mode; no runtime services >> yet. > > So the bootloader has to do the 64->32 transition? > Currently, yes. >> We are working on making it possible to boot via a EFI stub in >> assisted mode (still needing a bootloader, but with the boot stub in the >> kernel.) >> >> Runtime services will be the last piece, obviously, but even that looks >> reasonably doable. > > So why not start with the working case (default to EFI on 64 bit) and > add in the mostly non-working case (default to EFI on 32 bit) when it > actually mostly works? We can do that, but I really hate making gratuitous differences between 32 and 64 bits... we have too many of those already. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
