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Re: [Xen-devel] Unable to start PAE Mini-OS from 0x0

On 19 May 2006, at 22:35, Puthiyaparambil, Aravindh wrote:

I am trying to start PAE Mini-OS from 0x0 so that I can get access to
all 4GB. But it is failing in the builder (line 838 xc_linux_build.c)
when it tries to pin the L3 table with the following error below.
Further more, I am not able to bring up Mini-OS from any other address
other than 0xc0000000.

Is there a restriction on this in i386 PAE? Could someone please explain

Xen absolutely requires that the 4th PAE pgdir slot is filled as Xen hijacks entries in the pmd to map itself. In fact the builder should probably simply allocate 4 pmd pages always, and always fill all 4 slots of the top-level pgdir when running on PAE.

 -- Keir

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