在 2020/10/30 20:13, Jiaxun Yang 写道:
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?
Confirmed by another rev of the manual that it's only a tip for implementer.
I guess my assumption was wrong.
LPA should be read-only though.....
Thanks
- Jiaxun
Thanks
- Jiaxun
