Re: [PATCH 1/7] mips: dmi: Fix early remap on MIPS32

[Jiaxun Yang]

在2023年11月23日十一月 下午12:29，Thomas Bogendoerfer写道：
> On Thu, Nov 23, 2023 at 12:13:11PM +0000, Jiaxun Yang wrote:
>> > Ok. Thanks for the heads up. I'll fix the patch to be using ioremap()
>> > in v2. ioremap_uc() is just an macro-alias of ioremap() on MIPS.
>> 
>> Perhaps we need to fix ioremap_cache so it can give a KSEG1 address?
>
> KSEG0 ?

Ah yes it's KSEG0.

>
>> AFAIK for Loongson DMI is located at cached memory so using ioremap_uc
>> blindly will cause inconsistency.
>
> why ?

Firmware sometimes does not flush those tables from cache back to memory.
For Loongson systems (as well as most MTI systems) cache is enabled by
firmware.

Thanks.
>
> Thomas.
>
> -- 
> Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
> good idea.                                                [ RFC1925, 2.3 ]

-- 
- Jiaxun