[U-Boot] [PATCH 00/19] riscv: Adding RISC-V CPU and timer driver

[Anup Patel]

On Tue, Nov 13, 2018 at 1:47 PM Bin Meng <bmeng.cn at gmail.com> wrote:
>
> This adds DM drivers to support RISC-V CPU and timer.
>
> The U-Boot RISC-V SBI support is still working in progress.
> Some patches in this series like adding CSR numbers, exception
> numbers, are prerequisites for the SBI implementation, but it
> does no harm to include them as part of this series.
>
> This series is dependent on Lukas's riscv series @
> http://patchwork.ozlabs.org/project/uboot/list/?series=74999
>
> This series is available at u-boot-x86/riscv-working for testing.
>
>
> Bin Meng (18):
>   dm: cpu: Add timebase frequency to the platdata
>   riscv: qemu: Create a simple-bus driver for the soc node
>   cpu: Add a RISC-V CPU driver
>   riscv: Add a SYSCON driver for Core Local Interruptor
>   timer: Add driver for RISC-V privileged architecture defined timer
>   riscv: kconfig: Allow platform to specify Kconfig options
>   riscv: Enlarge the default SYS_MALLOC_F_LEN
>   riscv: qemu: Probe cpus during boot
>   riscv: Add CSR numbers
>   riscv: Add exception codes for xcause register
>   riscv: Do some basic architecture level cpu initialization
>   riscv: Move trap handler codes to mtrap.S
>   riscv: Fix context restore before returning from trap handler
>   riscv: Return to previous privilege level after trap handling
>   riscv: Adjust the _exit_trap() position to come before handle_trap()
>   riscv: Pass correct exception code to _exit_trap()
>   riscv: Refactor handle_trap() a little for future extension
>   riscv: Allow U-Boot to run on hart 0 only
>

I see that this series tries to setup infrastructure for
implementing SBI runtime servies.

You might want to consider OpenSBI library, will be
eventually available.
(Refer, https://linuxplumbersconf.org/event/2/contributions/196/attachments/127/159/Atish_SBI.pdf)

If every bootloader starts implementing SBI runtime
services then there will be lot of fragmentation and SOC
vendors will have to support SBI in variety of bootloaders.

Regards,
Anup