Building RISC-V BSP

[Denis Obrezkov]

2017-06-05 0:14 GMT+03:00 Hesham Almatary <heshamelmatary at gmail.com>:

> Hi Denis,
>
> Yes, the Host-Target-Interface (HTIF) has been refactored/removed in
> RISC-V. Also, it was meant to work with riscv front-end server
> (riscv-fesvr) which is not the case for your HiFive BSP I guess.
>
> I believe now it's the good time for you to start creating your own
> HiFive BSP. You'll have to read/know how to output data over the
> HiFive serial port or so, and develop your own console driver for the
> board. You might find this link useful [1] when creating a new BSP,
> and also use other BSPs as a reference (e.g. riscv_generic). Main
> things to be aware of when creating a new BSP are: 1) startup code, 2)
> console driver, and 3) timer driver. To make things easier for you,
> and to give you credit for your contributions when merged upstream,
> you'd want to create a new branch for your HiFive BSP based on
> priv-1.10, and rebase against it when/if I make changes to it.
>
> Keep the good work up.
>
> [1] https://devel.rtems.org/wiki/TBR/UserManual/Submitting_a_BSP
>
> Best,
> Hesham
>
> On Mon, Jun 5, 2017 at 7:00 AM, Denis Obrezkov <denisobrezkov at gmail.com>
> wrote:
> > 2017-06-04 16:17 GMT+03:00 Denis Obrezkov <denisobrezkov at gmail.com>:
> >>
> >> Now I have a problem with console-io.c file.
> >> The problem is with csr macros - there is no more such a register
> >> "tohost".
> >> Here it is described a little:
> >> https://github.com/riscv/riscv-pk/issues/25
> >>
> >> Could you explain what should be done here and what for was mtohost
> >> register?
> >>
> >
> > I have built riscv-generic bsp. Though there are a lot of warnings.
> > The current issue is that asm functions should be reimplemented (there
> is no
> > more
> > such a register 'mtohost' in csr).
> >
> > --
> > Regards, Denis Obrezkov
>
>
>
> --
> Hesham
>

Thanks Hasham,
will you be able to fix these asm functions to make BSP work in SPIKE
simulator?

Could you also point me to the good reference on risc-v assembler and about
assembler writing in general (for RISC) - I am not really good in it.

-- 
Regards, Denis Obrezkov
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