[OpenBIOS] L2 Cache Settings

[Programmingkid]

> On Jan 25, 2018, at 11:09 AM, Jd Lyons via OpenBIOS <openbios at openbios.org> wrote:
> 
> 
> 
>> On Jan 24, 2018, at 1:21 PM, Segher Boessenkool <segher at kernel.crashing.org> wrote:
>> 
>> On Wed, Jan 24, 2018 at 09:47:13AM -0500, Programmingkid wrote:
>>>> On Jan 23, 2018, at 4:57 PM, Segher Boessenkool <segher at kernel.crashing.org> wrote:
>>>> You meant something like
>>>> 
>>>> void enable_L2_7447A(void)
>>>> {
>>>> 	asm("mtspr %0,%1" : : "n"(1017), "r"(0x80000000));
>>>> }
>>> 
>>> I would change "asm" to "asm volatile" to prevent the compiler from optimizing this code out. 
>> 
>> The asm has no outputs so it is already volatile.
>> 
>> 
>> Segher
>> 
>> -- 
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>> Free your System - May the Forth be with you
> 
> Segher, if you have some of the old White Papers on the CPU’s that shipped in Mac’s, or the upgrades offered by third parties, I’d like to get a look at them, if your not under NDA.

This pdf has detailed information on the 7447A
https://www.nxp.com/docs/en/data-sheet/MPC7447AEC.pdf

This has a ton of information on the 7450 (probably still useful to you)
https://www.nxp.com/docs/en/reference-manual/MPC7450UM.pdf

This has information on programming PowerPC processors:
https://www.nxp.com/docs/en/reference-manual/MPCFPE32B.pdf