Want to add RISC-V-based PolarFire SoC support to RTEMS

[Padmarao.Begari at microchip.com]

Hi Hesham,

The generic RISC-V BSP is working on the PolarFire SoC without SMP but
doesn't work with SMP because it expects first HARTID  should be '0', t
he PolarFire SoC SMP starts with HARTID '1'(U54) because the HARTID
'0'(E51) reserved for first state booatloader. When the RTEMS is executing on the PolarFire SoC it reads hartid number with "HARTID-1" so that the SMP can start from hartid '0'.

i.e reason I have added seperate BSP for the PolarFire SoC.

Yes, there is a lot of code duplication and will try to re-use the
existing code for the PolarFire SoC with modification.

Will remove platform-dependent #ifdefs in startup code, is it Ok to
add CPU dependent #ifdefs?  

Regards
Padmarao

On Wed, 2022-08-24 at 11:00 +0100, Hesham Almatary wrote:
> Hello Padmarao,
> 
> It would be great to have support for running RTEMS on PolarFire.
> 
> I had a quick look at the code. There is a lot of code duplications
> already. The generic RISC-V BSP already has SMP, CLINT, PLIC, and
> 16550 support. Why can't this code be shared (i.e., if you use the
> riscv/riscv BSP and just provide your FDT)?
> 
> I'd also try to avoid introducing platform-dependent #ifdefs in
> shared
> code (e.g., start.S).
> 
> Cheers,
> Hesham
> 
> On Wed, 24 Aug 2022 at 08:14, <Padmarao.Begari at microchip.com> wrote:
> > Hi,
> > 
> > I want to add a new BSP for RISC-V-based Microchip PolarFire
> > SoC(MPFS)
> > to RTEMS.
> > 
> > The PolarFire SoC is the 4x 64-bit RISC-V U54 cores and a 64-bit
> > RISC-
> > V
> > E51 monitor core SoC from Microchip.
> > 
> > The new BSP is added for the U54 cores not for E51 because the E51
> > moniter core is resreved for first stage bootloader (Hart Software
> > Services).
> > 
> > This BSP supports below components:
> > 
> >     4 CPU Cores (U54)
> >     Interrupt controller (PLIC)
> >     Timer (CLINT)
> >     UART (mmuart, 16550-compatible)
> > 
> > We have already done some work on this and tested but not with
> > latest
> > RTEMS source(8th March, 2022 commit) and want to send patches with
> > latest source.
> > 
> > https://github.com/polarfire-soc/rtems/tree/mpfs-rtems
> > 
> > Regards
> > Padmarao
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