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SubjectRe: [RFC 0/2] RISC-V: A proposal to add vendor-specific code
On 11/5/18, Christoph Hellwig <> wrote:
> On Mon, Nov 05, 2018 at 02:58:07PM +0800, Vincent Chen wrote:
>> Many thanks for kinds of comments. I quickly synthesize the comments and
>> list them as below.
>> 1. The kernel image shall include all vendor-specific code.
> I fundamentally disagree with this… and think it should be the contrary.
> 1. The kernel shall support no vendor specific instructions whatsoever,
> period.

I think what was meant above is

1. If a vendor extension requires kernel support, that support
must be able to be built into a kernel image without breaking support
for CPUs that do not have that extension, to allow building a single
kernel image that works on all CPUs.


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