Re: How to increase memory in a RISCV32 image? Stuck with 988MB

[Thomas Huth]

On 17/04/2023 19.21, Mikhail R. Gadelha wrote:
> Hi qemu folks,
>
> I'm using yocto to generate a riscv32 image but qemu seems to be ignoring 
> the -m argument from the command line and forcing the image to run with 
> 988MB of RAM.
>
> Is there any way I can increase it to 4G?
>
> I'm using the following cmdline to start qemu:
>
> qemu-system-riscv32 -nographic -machine virt -m 4G -smp 8 -bios 
> /home/mgadelha/tools/poky/build/tmp/deploy/images/qemuriscv32/fw_jump.elf 
> -kernel /home/mgadelha/tools/poky/build/tmp/deploy/images/qemuriscv32/Image 
> -append "root=/dev/vda rw mem=4G" -drive 

That "mem=4G" part of the -append option looks suspicious ... have you 
already tried to boot without that, or to decrease it to a number that fits 
into 32-bit, e.g. "mem=3G" ?

 HTH,
  Thomas

> id=disk0,file=/home/mgadelha/tools/poky/build/tmp/deploy/images/qemuriscv32/core-image-full-cmdline-qemuriscv32-20230415202008.rootfs.ext4,if=none,format=raw
>  -device virtio-net-device,netdev=usernet -netdev 
> user,id=usernet,hostfwd=tcp::22222-:22 -device virtio-blk-device,drive=disk0 
> -object rng-random,filename=/dev/urandom,id=rng0 -device 
> virtio-rng-pci,rng=rng0 -device virtio-tablet-pci -device virtio-keyboard-pci
>
> Well, it actually doesn't start if I use -m 4G, but any value lower than 
> that is fine.
>
> Here's also the boot log: https://pastebin.com/b7ZEP659 
> <https://pastebin.com/b7ZEP659>
>
> I see that the kernel prints:
>
> [    0.000000] Memory limited to 1024MB
>
> so maybe it's a kernel limitation rather than qemu?
>
> --
>
> Mikhail Ramalho.