[Buildroot] [PATCH 1/1] arch: add support for RISC-V 64-bit (riscv64) architecture

[Mark Corbin]

Hello Arnout

On 04/09/18 00:00, Arnout Vandecappelle wrote:
>
> On 31/08/2018 11:11, Mark Corbin wrote:
>> This enables a riscv64 system to be built with a Buildroot generated
>> toolchain (gcc >= 7.x, binutils >= 2.30, glibc only).
>>
>> This configuration has been used to successfully build a qemu-bootable
>> riscv-linux-4.15 kernel (https://github.com/riscv/riscv-linux.git).
>>
>> Signed-off-by: Mark Corbin <mark.corbin at embecosm.com>
>> ---
>>  Makefile                                |   1 +
>>  arch/Config.in                          |  15 ++++
>>  arch/Config.in.riscv                    | 104 ++++++++++++++++++++++++
>>  arch/arch.mk.riscv                      |  24 ++++++
>>  package/binutils/Config.in.host         |   3 +
>>  toolchain/toolchain-buildroot/Config.in |  12 ++-
>  One more thing that is missing: in package/linux-headers/Config.in.host, you
> have to exclude all the linux versions that don't support riscv yet (i.e.
> everything before 4.15).
Is it worth doing this when you actually have to select a custom version
of headers anyway? This makes more sense to me when the necessary riscv
support makes it upstream. I think that it would be a bit messy at the
moment as I should add a restriction to stop you choosing *any* mainline
kernel version...

config BR2_KERNEL_HEADERS_4_1
        bool "Linux 4.1.x kernel headers"
        select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
        depends !BR2_riscv
.
.
etc.

...and also restrict your choice of versions for custom headers pre-4.15...

config BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_14
        bool "4.14.x"
        select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
        depends on !BR2_riscv

.
.
etc.

Quite happy to do this if that is what is wanted.

>
>  To simplify that job, you first might want (in separate patches) some
> deprecated versions: 4.10, 4.11, 4.12, 4.13.
I'm not sure that I'd want to start deprecating header versions that
might still be being used by people.

Regards

Mark

>  Regards,
>  Arnout
>

-- 

*Mark Corbin*
Embedded Operating Systems Lead
Phone: +44 1590 610184     Mobile: +44 7765 703479
Email: mark.corbin at embecosm.com
<mailto:mark.corbin at embecosm.com>     Web: https://www.embecosm.com

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