* Kendryte K210: state of MMU support?
@ 2020-06-28 15:54 Drew Fustini
2020-06-28 19:56 ` Sean Anderson
0 siblings, 1 reply; 2+ messages in thread
From: Drew Fustini @ 2020-06-28 15:54 UTC (permalink / raw)
To: linux-riscv, Atish Patra, Anup Patel, Damien Le Moal,
Sean Anderson, Carlos Eduardo de Paula
Hello - as far as I know, the MMU in the K210 is still not supported by Linux.
Anyone know of progress that has been made?
Thanks,
Drew
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* Re: Kendryte K210: state of MMU support?
2020-06-28 15:54 Kendryte K210: state of MMU support? Drew Fustini
@ 2020-06-28 19:56 ` Sean Anderson
0 siblings, 0 replies; 2+ messages in thread
From: Sean Anderson @ 2020-06-28 19:56 UTC (permalink / raw)
To: Drew Fustini, linux-riscv, Atish Patra, Anup Patel,
Damien Le Moal, Carlos Eduardo de Paula
On 6/28/20 11:54 AM, Drew Fustini wrote:
> Hello - as far as I know, the MMU in the K210 is still not supported by Linux.
>
> Anyone know of progress that has been made?
>
> Thanks,
> Drew
>
AFAIK support for the MMU is not planned, since it follows an older
version of the privilege-mode specs. For discussion, see [1], [2].
The CSRs to configure the MMU on the K210 can only be accessed via
M-mode, so the existing boot-chain with OpenSBI before Linux would not
work. In addition, as discussed in [1], there are some ties between
M-mode Linux and NOMMU on riscv. Aside from that, the only other major
differences are in the layout of some CSRs.
--Sean
[1] https://lore.kernel.org/linux-riscv/mhng-a9c74759-ab94-4270-a993-9df380811220@palmerdabbelt-glaptop1/T/#m56d9c49c53b104e282106005bf6d289cad4970a3
[2] https://lore.kernel.org/linux-riscv/20200312051107.1454880-1-damien.lemoal@wdc.com/T/#m137c2c073481f21207c92633550e6465ffc1c550
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2020-06-28 15:54 Kendryte K210: state of MMU support? Drew Fustini
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