New RISCV board (cartesi-machine)

[Ahmad Fatoum]

Hello Marcelo,

On 15.09.21 22:30, Marcelo Politzer wrote:
> Hi, I'm new to barebox
> 
> I'm currently porting barebox to a riscv board (cartesi-machine).

Oh, looks interesting! What SoC does it use?

> I got it mostly working:
> - new serial: serial_sbi.c and

Keep in mind that newer SBI versions deprecate
sbi_console_getchar() and sbi_console_putchar() with no replacement.

But if your board's firmware provides it, there is no issue with
adding a driver for it.

> - ext4 filesystem with mtdram
> 
> 1) What I am still trying to figure out is how to customize `env` correctly.
> I got it to build and appear based on the docs [1], [2],

Those look ok. I assume you have

defaultenv_append_directory(defaultenv_cartesi); in your board code?

> however the only way I found around [3] was to replace `bin/init` with
> this[4] layout.

After drivers probe, barebox invokes init to source init scripts and
do the countdown and such. This is written in C, but you can override
it with an /env/bin/init shell script, which is what you did here.

I would not recommend this. Drop /env/bin/init and use the same C init
nearly everyone else does. You can still customize it via the
/env/init/ scripts

> Is there a recommended way to go about this?

You need to set boot.default, e.g.

echo 'cartesi net' > defaultenv-cartesi/nv/boot.default

Which would try cartesi first and then net if the first one failed.

> 2) I also would like clarification on the upstreaming process, is it
> PR based, patches on this list?

Patches to the mailing list are the usual way of contributing.

Cheers,
Ahmad

> 
> best,
> Marcelo
> 
> 
> [1] Makefile:
> ```
> bbenv-$(CONFIG_BOARD_CARTESI) += defaultenv-cartesi
> ```
> 
> [2] arch/riscv/boards/cartesi:
> ```
> defaultenv-cartesi
> ├── boot
> │   └── cartesi
> ├── init
> │   ├── automount
> │   └── ps1
> └── nv
>     ├── allow_color
>     ├── autoboot_timeout
>     └── user
> ```
> 
> [3]
> ```
> Hit m for menu or any to stop autoboot:    0
> Booting entry 'net'
> ```
> 
> [4]
> ```
> defaultenv-cartesi
> ├── bin
> │   └── init
> └── boot
>     └── cartesi
> ```
> 
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> 


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