[coreboot] The OS of open source solution

Patrick Georgi patrick at georgi-clan.de
Thu Oct 17 09:50:42 CEST 2013

Am 17.10.2013 09:38, schrieb Stojsavljevic, Zoran:
>  For Windows 7, it has two boot modes: legacy 32-bit boot mode, and
> UEFI 64-bit boot mode.  The former/legacy boot mode boots from any
> legacy BIOS (SeaBIOS, AMI, Intel, etc.), and the latter one requires
> few UEFI run-time services.
> They say that Windows 8 only boots from
> UEFI, but it might be possible to boot with SeaBIOS using 32-bit
> Windows is becoming possible.  Run-time services will not disappear
> during or after boot, but all other boot firmware will.
Both 32bit and 64bit Windows, both 7 and 8, are supposed to be bootable 
with PC BIOS. It's just that logo requirements mandate UEFI for Windows 
8, but that says nothing about its capability to boot with SeaBIOS.

When booting with UEFI, 64bit is required, since they only interface 
with the 64bit version of the UEFI APIs.

However you can't boot a BIOS-installed Windows with UEFI and 
vice-versa. So if you installed an UEFI Windows, SeaBIOS won't be able 
to run it.

Solution: Do fresh Windows installs from BIOS (UEFI+CSM is enough), then 
use these for your coreboot experiments.

If you're creating new installations, consider obtaining "checked" 
Windows builds (available through MSDN channels). Those are much more 
useful for debugging, in particular when it comes to ACPI issues (with 
one caveat, see http://www.coreboot.org/ACPI#Using_checked_builds).


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