This turned out to be a buggy BIOS on these Toshiba laptops. There is a work-around in the Ubuntu forums which fixes it. Thanks for your help Keir.
http://ubuntuforums.org/showthread.php?t=1470732&page=2
http://kerneltrap.org/mailarchive/git-commits-head/2010/5/20/34989
Roger R. Cruz
-----Original Message-----
From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
Sent: Tue 8/3/2010 4:01 PM
To: Roger Cruz; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Problems booting Xen on Toshiba Satellite L505
On 03/08/2010 20:06, "Roger Cruz" <roger.cruz@xxxxxxxxxxxxxxxxxxx> wrote:
>
>
> I have tried Xen-3.4.2 and Xen-4.1-unstable on a new i3 Toshiba Satellite L505
> and with both versions, I get a blinking cursor upon boot. I used the code
> from 3.4.2 to narrow down the problem to this section of code in x86_64.S
Never heard of anything like this. You'll have to fiddle around some more
I'm afraid. Can you get any output onto the screen before this point, and
maybe get some debug tracing out that way... Does everything work okay if
you get out of the loop? Vector 7 is device-not-available, so could be FPU
related perhaps.
K.
> /* Initialise IDT with simple error defaults. */
> leaq ignore_int(%rip),%rcx
> movl %ecx,%eax
> andl $0xFFFF0000,%eax
> orl $0x00008E00,%eax
> shlq $32,%rax
> movl %ecx,%edx
> andl $0x0000FFFF,%edx
> orl $(__HYPERVISOR_CS64<<16),%edx
> orq %rdx,%rax
> shrq $32,%rcx
> movl %ecx,%edx
> leaq idt_table(%rip),%rdi
> movl $256,%ecx
> 1: movq %rax,(%rdi)
> movq %rdx,8(%rdi)
> addq $16,%rdi
> loop 1b
>
> The code never gets out of the loop to execute the following lines:
>
> /* Pass off the Multiboot info structure to C land. */
> mov multiboot_ptr(%rip),%edi
> call __start_xen
>
> By playing around with the loop counter in ECX, I determined that loading
> vectors 0-6 works (ie, it gets out of the loop)... but as soon as vector 7 is
> written, we never get out of the loop and I get a blinking cursor. Does
> anyone have any ideas or suggestions?
>
> Thanks
>
> Roger R. Cruz
>
>
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