linux-kernel - Re: [PATCH 0/2] riscv: support ELF format binaries in nommu mode

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Message-ID: <Y/8e/7lfr0iWxnAd@x1-carbon>
Date:   Wed, 1 Mar 2023 09:46:40 +0000
From:   Niklas Cassel <Niklas.Cassel@....com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
CC:     Palmer Dabbelt <palmer@...belt.com>,
        "gerg@...nel.org" <gerg@...nel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] riscv: support ELF format binaries in nommu mode

On Wed, Mar 01, 2023 at 07:49:05AM +0900, Damien Le Moal wrote:

(snip)

> > Adding Damien, as IIRC he's had some hacked up userspace bits for the 
> > K210.  I'm yet to get anything running, but it'd be great if we get this 
> > to a point where I can actually boot test this on QEMU (I'm just doing 
> > builds now).
> 
> +Niklas
> 
> Niklas, didn't you add a nommu qemu build for buildroot ? Can't find the config
> though...

Yes, I did.

In buildroot:
$ make qemu_riscv64_nommu_virt_defconfig

The QEMU command line generated by buildroot:
qemu-system-riscv64 -M virt -bios none -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -nographic -cpu rv64,mmu=off # qemu_riscv64_nommu_virt_defconfig

Compared to a regular riscv64 QEMU command line, the relevant parameter is:
-cpu rv64,mmu=off


Kind regards,
Niklas