Re: [PATCH 1/6] MIPS: Loongson64: Do not write the read only field LPA of CP0_CONFIG3

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在 2020/10/30 14:22, Tiezhu Yang 写道:
On 10/30/2020 12:00 PM, Jiaxun Yang wrote:


在 2020/10/29 16:02, Tiezhu Yang 写道:
The field LPA of CP0_CONFIG3 register is read only for Loongson64, so the
write operations are meaningless, remove them.

Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
  arch/mips/include/asm/mach-loongson64/kernel-entry-init.h | 8 --------
  arch/mips/loongson64/numa.c                               | 3 ---
  2 files changed, 11 deletions(-)
Hi Tiezhu,

AFAIK it's not read only on 3A1000.
Have you check with hardware guys?

Hi Jiaxun,

Yes, I checked it before send this patch,  the field LPA of CP0_CONFIG3
on 3A1000 is also read only,  we can see the related description in the
chapter 3.22 of Loongson_3A1000_cpu_user_2.

On page 36, it said:
"能否写ELPA位依赖于Config3寄存器的LPA域 。当Config3的LPA位为0时,
PageGrain的ELPA位被置位。"

Don't know if it matters.

@Huacai, Any comments? Do you know why it exists here?

Thanks

- Jiaxun




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