ACPI (bios section) parsing RSDP and RSDT tables in kernel boot process

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Hi,

I've been working on ACPI parsing tables in kernel boot process, but
when I grab RSDP parsing bios section address (0x00000 to 0x00400) and
try access rsdt->header after casting rsdt_physical_address that is into
rsdp sctruct I got a halt all the time. I would like to know how if you
already reached this issue. I'm supposing that is a problem in map
rsdt_phys_address to virt, and so access rsdt->header, but I'm note
sure. 
Had anyone this issue in acpi-tp-development? 


Regards,
Leonidas.  


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