From: Alvaro del Castillo 
To: pdiaz [AT] cavecanen [DOT] org
Date: 31-07-05 10:52
   
Hi Pedro!

Thanks for your page:

http://www.cavecanen.org/linux/x300/

I am changing finally my Dell X300 A04 BIOS DSDT now that I can do it
without patching the kernel.

It is difficult for some people, as me, to find the exact numbers for
the System Memory. The best way to do it is:

1. Dump your current DSDT table:

cat /proc/acpi/dsdt > dsdt.aml
./iasl -d dsdt.aml > dsdt.asl

2. Diff your current DSDT with the modified one from ACPI4Linux:

diff Dell-Latitude_X300-A04-custom.asl dsdt.dsl > info

3. Look into the diff to see how you should write Memory Information.
For example in my system:

88c88
<     OperationRegion (MNVS, SystemMemory, 0x276ECD79, 0x40)
---
>     OperationRegion (MNVS, SystemMemory, 0x0F6ECD79, 0x40)
661c661
<         OperationRegion (PHSD, SystemMemory, 0x276FCDBD, 0x00000190)
---
>         OperationRegion (PHSD, SystemMemory, 0x0F6FCDBD, 0x00000190)
2190c2190
<                 OperationRegion (VNVS, SystemMemory, 0x276ECDB9,
0x00010004)
---
>                 OperationRegion (VNVS, SystemMemory, 0x0F6ECDB9,
0x00010004)


Also, you can see the changes you are doing to the DSDT. In my
configuration only:

<                     Field (ECR, ByteAcc, Lock, Preserve)
---
>                     Field (ECR, DWordAcc, Lock, Preserve)

Cheers

-- 
http://acs.barrapunto.org