On 1/28/09, Aurelien Jarno aurelien@aurel32.net wrote:
Mark Cave-Ayland a écrit :
Hi everyone,
Whilst playing around with openbios to try and understand how it works on different platforms, I found that using coreboot-v3 with openbios SVN causes openbios to panic on boot under qemu SVN. The trace can be found here:
http://pastebin.siriusit.co.uk/coreboot-v3-panic.txt
With the help of some people on the coreboot mailing list, I've performed an SVN bisection and found that the panic starts appearing at r416 in openbios SVN for which the commit message can be found here:
http://lists.openbios.org/pipermail/openbios/2009-January/003401.html
However, I can't find any reference to the rationale behind the commit. Can anyone explain further explain whether is commit is correct or not?
The rationale is available here: http://lists.openbios.org/pipermail/openbios/2009-January/003391.html
This commit fixes two different problems encountered on SPARC64 and PowerPC. First of all it makes sure that no PCI device get allocated port 0, which doesn't exists.
Secondly it fixes problems with non-PCI devices that are using I/O ports at fixed location. This includes the video card, i8259, rtc, serial port, hard-disk controller, etc. Without this patch, the PCI cards are getting allocated the I/O ports of those devices, thus causing crashes.
I wonder why it causes problem on x86. What is the initial value of arch->io_base? I am unable to find that looking at the code.
I think "arch" (a bit unfortunate name choice for grepping) does not get initialized at all for x86.