Re: [Xen-devel] Xen & Transmeta (from xen-users)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26 May 2005, at 21:59, Carl Holtje ;021;vcsg6; wrote:

> Ok.. next hurdle- the ACPI checksum function 
> (xen/drivers/acpi/tables.c)
> is returning zero -- it calculates the sum to be 1536 (0x600). After 
> the
> AND with 0xFF, zero results..
That's a _good_ thing: returning zero means the checksum was valid. The 
checksum is a single byte value, which is why the return value is ANDed 
with 0xff.
> This appears to really throw everything else (the remaining ACPI stuff)
> off, as other ACPI properties aren't located/read/understood. This
> confusion results in a page fault originating from
> xen/drivers/acpi/tables.c#acpi_table_get_sdt ..
It's not been thrown off -- the fault is probably due to a table not 
being properly dynamically mapped, or something like that. Look 
carefully where the pointer you are dereferencing originated from.
> Is this indicative of issues to come, or is this just part of 
> supporting a
> new platform?
If the CPU has a local APIC and supports 4MB superpages then it 
oughtn't to be that hard to get working...
 -- Keir


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