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SubjectRe: Boot strapping and ATE
"Ian S. Nelson" wrote:

> Two hopefully quick questions.
>
> I'm building an embedded device out of linux and I was having trouble
> booting. Probably a FAQ, right?
> I've got a loader that loads an uncompressed and stripped kernel in to
> memory at 0x100000 (this is x86) I set up the GDT just like setup.S does
> but when the paging bit is flipped on in head.S it goes off in to the
> weeds. Any ideas? I've got limited diagnostic capability, I can post
> bytes. It happens immediately when the paging bit is flipped on. It
> looks like all my segment registers are set right, my a20 test shows
> that it's up, my lgdt and ljmp in to protected mode seems to work. I
> try to load it in to the exact same spot as setup.S does. We're
> attempting to build a LinuxBIOS style boot loader on the NSC MediaGX1,
> we're knocking on the door too, made it into the kernel and we're so so
> close. I've been trying to debug this for months now, any ideas are
> appriciated, I'm not really an x86 hack so even stupid ideas are good
> ones..
>
> Secondly, has anyone put together some ATE type tests for running under
> Linux? That stuff is usually kind of hardware specific but memory tests
> and certain PCI and chip tests could be generalized. The unfortunate
> downside of using a LinuxBIOS style boot loader is that you can't run
> DOS or DOS programs on the hardware and DOS is the linuga franca of x86
> based ATE tests, from what I gather.
>
> thanks,
> Ian
>
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I used to code such thing and got the same result. My only way to get things
to work was to have the
same phys/virtual mapping when setting the paging flag. Even if linux works
on my machine, when i
coded myself, nothing else worked but having the same mapping.
hope it helps......

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