Re: Question: SiFive U SPI and SD

[Bin Meng]

Hi Nikita,

On Sun, Feb 9, 2020 at 10:56 PM Nikita Ermakov <address@hidden> wrote:
>
> Hello!
>
> I am trying to make an SD card working on the sifive_u (hw/riscv/sifive_u.c) 
> SoC machine.
> As far as I understand there is no way to connect an SD card to the SoC with 
> cmdline for now. So, I started to dig in to the QEMU internals and especially 
> sifive_u SoC implementation to try to understand how I could connect SD card 
> to this SoC.
>
> From what I understood I need to:
> 1) Implement SiFive U SPI controller.

This one is definitely needed.

> 2) Implement spi-sd adapter in a way like the hw/sd/ssi-sd.c

I believe we can just use hw/sd/ssi-sd.c.

>
> Probably I should merge 1) and 2) into one hw/riscv/sifive_u_spi.c source 
> file.
>
> Could somebody correct me please if I am wrong at some point?
> I am newbie in the QEMU internals :)
>
> The purpose is why I want to implement this is to boot up the Linux kernel on 
> '-machine sifive_u' and load rootfs from SD.

Regards,
Bin