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Re: [PATCH 3/3] target/mips: Disable DSP ASE for Octeon68XX


From: Richard Henderson
Subject: Re: [PATCH 3/3] target/mips: Disable DSP ASE for Octeon68XX
Date: Mon, 31 Oct 2022 11:05:46 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2

On 10/29/22 13:00, Jiaxun Yang wrote:
I don't have access to Octeon68XX hardware but accroading to
my investigation Octeon never had DSP ASE support.

As per "Cavium Networks OCTEON Plus CN50XX Hardware Reference
Manual" CP0C3_DSPP is reserved bit and read as 0. Also I do have
access to a Ubiquiti Edgerouter 4 which has Octeon CN7130 processor
and I can confirm CP0C3_DSPP is read as 0 on that processor.

Further more, in linux kernel:
arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h
cpu_has_dsp is overridden as 0.

So I believe we shouldn't emulate DSP in QEMU as well.

Signed-off-by: Jiaxun Yang<jiaxun.yang@flygoat.com>
---
  target/mips/cpu-defs.c.inc | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Richard Henderson <richard.henderson@linaro.org>

r~



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