Date: Sun, 20 Nov 2022 08:50:12 +0100
From: Waldemar Brodkorb <wbx@openadk.org>
To: Yimin Gu <ustcymgu@gmail.com>
Message-ID: <Y3ncNLHK8OQhOo7d@waldemar-brodkorb.de>
References: <20221117140349.27692-1-ustcymgu@gmail.com>
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Subject: Re: [Buildroot] [PATCH 0/1] arch/riscv: RISC-V 32-bit NO MMU support
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Cc: Romain Naour <romain.naour@gmail.com>, Mark Corbin <mark@dibsco.co.uk>,
 buildroot@buildroot.org
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Hi,
Yimin Gu wrote,

> The following patch adds support for 32-bit RISC-V No-MMU build.
> Currently for No-MMU RISC-V, only 64-bit is supported. There're no
> substancial changes in code but macros and compiling options. Uclibc,
> elf2flt, and the kernel need to be patched. 
> This is based on damien-lemoal/buildroot which first added 64-bit No-MMU
> support, and my earlier porting attempt regymm/buildroot. 
> As a lot of FPGA-based RISC-V cores are 32-bit and many of the low ones
> are without MMU, this can bring Linux to cores as light as RV32IMA.
> For this reason, only the minimum required extensions are enabled in the
> buildroot and kernel configurations. 
> 
> Yimin Gu (1):
>   arch/riscv: RISC-V 32-bit NO MMU support
> 
>  arch/Config.in.riscv                          |    2 -
>  board/riscv/nommu/patches/linux-headers       |    1 +
>  ...imental-RISC-V-32-bit-No-MMU-support.patch | 1355 +++++++++++++++++
>  configs/qemu_riscv32_nommu_virt_defconfig     |   19 +
>  package/Makefile.in                           |   13 +-
>  ...ed-RISC-V-32-bit-compilation-support.patch |   74 +
>  .../uclibc/0001-RISC-V-32-bit-support.patch   |  145 ++
>  package/uclibc/Config.in                      |    2 +
>  8 files changed, 1607 insertions(+), 4 deletions(-)
>  create mode 120000 board/riscv/nommu/patches/linux-headers
>  create mode 100644 board/riscv/nommu/patches/linux/5.19/0001-Experimental-RISC-V-32-bit-No-MMU-support.patch
>  create mode 100644 configs/qemu_riscv32_nommu_virt_defconfig
>  create mode 100644 package/elf2flt/0006-Added-RISC-V-32-bit-compilation-support.patch
>  create mode 100644 package/uclibc/0001-RISC-V-32-bit-support.patch

You can add a 
Tested-By: Waldemar Brodkorb <wbx@openadk.org>

One minor note, add a startup description for noMMU in
board/qemu/riscv32-virt/readme.txt.

best regards
 Waldemar
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