Hi John, --- On Tue, 11/30/10, John Baldwin <[email protected]> wrote:
> From: John Baldwin <[email protected]> > Subject: Re: How to debug BTX loader? > To: [email protected] > Cc: "Darmawan Salihun" <[email protected]> > Date: Tuesday, November 30, 2010, 9:38 AM > On Monday, November 29, 2010 1:01:27 > pm Darmawan Salihun wrote: > > Hi guys, > > > > I'm currently working on a BIOS for a custom Single > Board Computer (SBC). > > I have the required BIOS source code and tools at > hand. > > However, the boot process always stuck in the BTX > loader > > (the infamous "ACPI autoload failed") when I booted > out of USB stick > > (with the FreeBSD 8.1 USB stick image). > > > > I could get the system to boot into FreeBSD 8.1 > > (by keeping the CDROM tray open and close it when the > board looks for > > boot device, otherwise BTX will reboot instantly). > > Are you getting an actual BTX error message or a > freeze? BTX is just a > minikernel written all in assembly. It doesn't handle > loading the kernel, > etc. All that work is done by the /boot/loader > program (which is written in > C). You can find all the source to the boot code in > src/sys/boot. The BTX > kernel is in src/sys/boot/i386/btx/btx/. > > However, to debug this further we would need more info such > as what exactly > you are seeing (a hang, a BTX fault with a register dump, > etc.). One of the BTX fault shows the register dump in the attachment. I hope this could help. Anyway, If I were to try to interpret such register dump, where should I start? I understand x86/x86_64 assembly pretty much, but I'm not quite well versed with the FreeBSD code using it. Thanks, Darmawan > > -- > John Baldwin >
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