Emulating sd card with hifive_u risc-v machine

Emulating sd card with hifive_u risc-v machine

[Pascal Scholz]

Hi all,

I'm hoping that I addressed the right mailing lists.

I'm working a bit with qemu's risc-v emulation. My current goal is to 
simulate a complete boot process for the SiFive Unleashed Board (SU 540 
SoC)[1]. I've created the correspondig OpenSBI and U-Boot images, being 
the -bios and the -kernel images. It's possible for me to boot up to the 
U-Boot prompt. From this prompt I now want to boot an system image 
located on an emulated sd card.

However I now fail to get a working sd card within qemu for the device 
sifive_u. For example i tried the following command:

qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios 
build/platform/sifive/fu540/firmware/fw_jump.bin -kernel 
../../u-boot/u-boot.bin -device sdhci-pci -device sd-card,drive=sdX 
-drive id=sdX,if=none,format=raw,file=path/to/image.elf

This results in Qemu telling me: -device sdhci-pci: No 'PCI' bus found 
for device 'sdhci-pci'.

Using the machine "virt" the command above works.

The thing i tried was:

qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios 
opensbi/build/platform/sifive/fu540/firmware/fw_jump.bin -kernel 
../u-boot/u-boot.bin -sd path/to/image.elf

Resulting in: machine type does not support if=sd,bus=0,unit=0


Even if the machine gets stuck at some point when booting, Qemu has no 
problem starting the VM if I use "-M virt" instead of "-M sifive_u". At 
this point i think, that the machine "sifive_u" doesn't support sd 
cards? Is this guess right or is there anything left I can try? After 
all I'm a bit confused, because there seems to be a block device "sd0" 
when I try to start the machine "sifive_u" without any additional 
device/drive arguments. I would really appreciate if someone would tell 
me, what I'm doing wrong.

Thanks in advance and stay healthy!

Best regards

Pascal


[1] https://www.sifive.com/boards/hifive-unleashed

Re: Emulating sd card with hifive_u risc-v machine

[Alistair Francis]

On Mon, Feb 8, 2021 at 12:00 PM Pascal Scholz
<s6899329@msx.tu-dresden.de> wrote:
>
> Hi all,
>
> I'm hoping that I addressed the right mailing lists.

Hello Pascal,

Yep, this is the right place :)

>
> I'm working a bit with qemu's risc-v emulation. My current goal is to
> simulate a complete boot process for the SiFive Unleashed Board (SU 540
> SoC)[1]. I've created the correspondig OpenSBI and U-Boot images, being
> the -bios and the -kernel images. It's possible for me to boot up to the
> U-Boot prompt. From this prompt I now want to boot an system image
> located on an emulated sd card.
>
> However I now fail to get a working sd card within qemu for the device
> sifive_u. For example i tried the following command:
>
> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
> build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
> ../../u-boot/u-boot.bin -device sdhci-pci -device sd-card,drive=sdX
> -drive id=sdX,if=none,format=raw,file=path/to/image.elf
>
> This results in Qemu telling me: -device sdhci-pci: No 'PCI' bus found
> for device 'sdhci-pci'.
>
> Using the machine "virt" the command above works.
>
> The thing i tried was:
>
> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
> opensbi/build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
> ../u-boot/u-boot.bin -sd path/to/image.elf
>
> Resulting in: machine type does not support if=sd,bus=0,unit=0
>
>
> Even if the machine gets stuck at some point when booting, Qemu has no
> problem starting the VM if I use "-M virt" instead of "-M sifive_u". At
> this point i think, that the machine "sifive_u" doesn't support sd
> cards? Is this guess right or is there anything left I can try? After

Correct. There is no SD card support for the SiFive U in QEMU.

You actually just reminded me though that someone has sent patches to
add support and I need to review them.

You can find the patches here:
https://patchew.org/QEMU/20210126060007.12904-1-bmeng.cn@gmail.com/
which should work when applied to QEMU.

If you do get a chance to test the patches it would be great if you
can let me know what works/doesn't work for you.

Alistair

> all I'm a bit confused, because there seems to be a block device "sd0"
> when I try to start the machine "sifive_u" without any additional
> device/drive arguments. I would really appreciate if someone would tell
> me, what I'm doing wrong.
>
> Thanks in advance and stay healthy!
>
> Best regards
>
> Pascal
>
>
> [1] https://www.sifive.com/boards/hifive-unleashed
>
>

Re: Emulating sd card with hifive_u risc-v machine

[Pascal Scholz]

Hi Alistair,

thanks for your quick and helpful reply. :)

I'll see, if I can try them out on the weekend and will report my results.

Best regards and thanks again!

Pascal

On 08.02.21 23:49, Alistair Francis wrote:
> On Mon, Feb 8, 2021 at 12:00 PM Pascal Scholz
> <s6899329@msx.tu-dresden.de> wrote:
>> Hi all,
>>
>> I'm hoping that I addressed the right mailing lists.
> Hello Pascal,
>
> Yep, this is the right place :)
>
>> I'm working a bit with qemu's risc-v emulation. My current goal is to
>> simulate a complete boot process for the SiFive Unleashed Board (SU 540
>> SoC)[1]. I've created the correspondig OpenSBI and U-Boot images, being
>> the -bios and the -kernel images. It's possible for me to boot up to the
>> U-Boot prompt. From this prompt I now want to boot an system image
>> located on an emulated sd card.
>>
>> However I now fail to get a working sd card within qemu for the device
>> sifive_u. For example i tried the following command:
>>
>> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
>> build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
>> ../../u-boot/u-boot.bin -device sdhci-pci -device sd-card,drive=sdX
>> -drive id=sdX,if=none,format=raw,file=path/to/image.elf
>>
>> This results in Qemu telling me: -device sdhci-pci: No 'PCI' bus found
>> for device 'sdhci-pci'.
>>
>> Using the machine "virt" the command above works.
>>
>> The thing i tried was:
>>
>> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
>> opensbi/build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
>> ../u-boot/u-boot.bin -sd path/to/image.elf
>>
>> Resulting in: machine type does not support if=sd,bus=0,unit=0
>>
>>
>> Even if the machine gets stuck at some point when booting, Qemu has no
>> problem starting the VM if I use "-M virt" instead of "-M sifive_u". At
>> this point i think, that the machine "sifive_u" doesn't support sd
>> cards? Is this guess right or is there anything left I can try? After
> Correct. There is no SD card support for the SiFive U in QEMU.
>
> You actually just reminded me though that someone has sent patches to
> add support and I need to review them.
>
> You can find the patches here:
> https://patchew.org/QEMU/20210126060007.12904-1-bmeng.cn@gmail.com/
> which should work when applied to QEMU.
>
> If you do get a chance to test the patches it would be great if you
> can let me know what works/doesn't work for you.
>
> Alistair
>
>> all I'm a bit confused, because there seems to be a block device "sd0"
>> when I try to start the machine "sifive_u" without any additional
>> device/drive arguments. I would really appreciate if someone would tell
>> me, what I'm doing wrong.
>>
>> Thanks in advance and stay healthy!
>>
>> Best regards
>>
>> Pascal
>>
>>
>> [1] https://www.sifive.com/boards/hifive-unleashed
>>
>>

Re: Emulating sd card with hifive_u risc-v machine

[Alistair Francis]

On Wed, Feb 10, 2021 at 12:02 PM Pascal Scholz
<pascal.scholz@tu-dresden.de> wrote:
>
> Hi Alistair,
>
> thanks for your quick and helpful reply. :)
>
> I'll see, if I can try them out on the weekend and will report my results.

Great!

>
> Best regards and thanks again!

No worries!

Alistair

>
> Pascal
>
> On 08.02.21 23:49, Alistair Francis wrote:
> > On Mon, Feb 8, 2021 at 12:00 PM Pascal Scholz
> > <s6899329@msx.tu-dresden.de> wrote:
> >> Hi all,
> >>
> >> I'm hoping that I addressed the right mailing lists.
> > Hello Pascal,
> >
> > Yep, this is the right place :)
> >
> >> I'm working a bit with qemu's risc-v emulation. My current goal is to
> >> simulate a complete boot process for the SiFive Unleashed Board (SU 540
> >> SoC)[1]. I've created the correspondig OpenSBI and U-Boot images, being
> >> the -bios and the -kernel images. It's possible for me to boot up to the
> >> U-Boot prompt. From this prompt I now want to boot an system image
> >> located on an emulated sd card.
> >>
> >> However I now fail to get a working sd card within qemu for the device
> >> sifive_u. For example i tried the following command:
> >>
> >> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
> >> build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
> >> ../../u-boot/u-boot.bin -device sdhci-pci -device sd-card,drive=sdX
> >> -drive id=sdX,if=none,format=raw,file=path/to/image.elf
> >>
> >> This results in Qemu telling me: -device sdhci-pci: No 'PCI' bus found
> >> for device 'sdhci-pci'.
> >>
> >> Using the machine "virt" the command above works.
> >>
> >> The thing i tried was:
> >>
> >> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
> >> opensbi/build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
> >> ../u-boot/u-boot.bin -sd path/to/image.elf
> >>
> >> Resulting in: machine type does not support if=sd,bus=0,unit=0
> >>
> >>
> >> Even if the machine gets stuck at some point when booting, Qemu has no
> >> problem starting the VM if I use "-M virt" instead of "-M sifive_u". At
> >> this point i think, that the machine "sifive_u" doesn't support sd
> >> cards? Is this guess right or is there anything left I can try? After
> > Correct. There is no SD card support for the SiFive U in QEMU.
> >
> > You actually just reminded me though that someone has sent patches to
> > add support and I need to review them.
> >
> > You can find the patches here:
> > https://patchew.org/QEMU/20210126060007.12904-1-bmeng.cn@gmail.com/
> > which should work when applied to QEMU.
> >
> > If you do get a chance to test the patches it would be great if you
> > can let me know what works/doesn't work for you.
> >
> > Alistair
> >
> >> all I'm a bit confused, because there seems to be a block device "sd0"
> >> when I try to start the machine "sifive_u" without any additional
> >> device/drive arguments. I would really appreciate if someone would tell
> >> me, what I'm doing wrong.
> >>
> >> Thanks in advance and stay healthy!
> >>
> >> Best regards
> >>
> >> Pascal
> >>
> >>
> >> [1] https://www.sifive.com/boards/hifive-unleashed
> >>
> >>

Re: Emulating sd card with hifive_u risc-v machine

[Bin Meng]

Hi Pascal,

On Thu, Feb 11, 2021 at 5:47 AM Pascal Scholz
<pascal.scholz@tu-dresden.de> wrote:
>
> Hi Alistair,
>
> thanks for your quick and helpful reply. :)
>
> I'll see, if I can try them out on the weekend and will report my results.
>
> Best regards and thanks again!
>
> Pascal
>
> On 08.02.21 23:49, Alistair Francis wrote:
> > On Mon, Feb 8, 2021 at 12:00 PM Pascal Scholz
> > <s6899329@msx.tu-dresden.de> wrote:
> >> Hi all,
> >>
> >> I'm hoping that I addressed the right mailing lists.
> > Hello Pascal,
> >
> > Yep, this is the right place :)
> >
> >> I'm working a bit with qemu's risc-v emulation. My current goal is to
> >> simulate a complete boot process for the SiFive Unleashed Board (SU 540
> >> SoC)[1]. I've created the correspondig OpenSBI and U-Boot images, being
> >> the -bios and the -kernel images. It's possible for me to boot up to the
> >> U-Boot prompt. From this prompt I now want to boot an system image
> >> located on an emulated sd card.

Yep, your goal is now satisfied with the patch series Alistair pointed
out, along with one more dependent series (see below)

> >>
> >> However I now fail to get a working sd card within qemu for the device
> >> sifive_u. For example i tried the following command:
> >>
> >> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
> >> build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
> >> ../../u-boot/u-boot.bin -device sdhci-pci -device sd-card,drive=sdX
> >> -drive id=sdX,if=none,format=raw,file=path/to/image.elf
> >>
> >> This results in Qemu telling me: -device sdhci-pci: No 'PCI' bus found
> >> for device 'sdhci-pci'.
> >>
> >> Using the machine "virt" the command above works.
> >>
> >> The thing i tried was:
> >>
> >> qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios
> >> opensbi/build/platform/sifive/fu540/firmware/fw_jump.bin -kernel
> >> ../u-boot/u-boot.bin -sd path/to/image.elf
> >>
> >> Resulting in: machine type does not support if=sd,bus=0,unit=0
> >>
> >>
> >> Even if the machine gets stuck at some point when booting, Qemu has no
> >> problem starting the VM if I use "-M virt" instead of "-M sifive_u". At
> >> this point i think, that the machine "sifive_u" doesn't support sd
> >> cards? Is this guess right or is there anything left I can try? After
> > Correct. There is no SD card support for the SiFive U in QEMU.
> >
> > You actually just reminded me though that someone has sent patches to
> > add support and I need to review them.
> >
> > You can find the patches here:
> > https://patchew.org/QEMU/20210126060007.12904-1-bmeng.cn@gmail.com/
> > which should work when applied to QEMU.

Note you will also need to apply the following SD card patches to make it work:
http://patchwork.ozlabs.org/project/qemu-devel/list/?series=226785

> >
> > If you do get a chance to test the patches it would be great if you
> > can let me know what works/doesn't work for you.

Please test and report.

Regards,
Bin