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Thu, 18 Dec 2025 13:18:56 -0800 (PST) Received: from [192.168.0.13] ([172.92.174.155]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34e70d676b8sm3310867a91.8.2025.12.18.13.18.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 Dec 2025 13:18:55 -0800 (PST) Message-ID: Date: Thu, 18 Dec 2025 13:17:16 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] p8700: don't use AMO instructions To: Vladimir Kondratiev , anup@brainfault.org Cc: opensbi@lists.infradead.org References: <20251218114705.1650842-1-vladimir.kondratiev@mobileye.com> Content-Language: en-US From: Bo Gan In-Reply-To: <20251218114705.1650842-1-vladimir.kondratiev@mobileye.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251218_131857_511117_0C9B1C0B X-CRM114-Status: GOOD ( 11.41 ) X-BeenThere: opensbi@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "opensbi" Errors-To: opensbi-bounces+opensbi=archiver.kernel.org@lists.infradead.org Why not override PLATFORM_RISCV_ISA at build time? I think this change is going to affect the entire generic/ platform. Specifically jh7110 won't even boot with lrsc. The Hart 0 (S7 core) only support AMO, not LR/SC, the opposite of your p8700. Bo On 12/18/25 03:47, Vladimir Kondratiev wrote: > P8700 supports LR/SC but not AMO instructions. > Tell this to the compiler, it will in turn > define __riscv_zalrsc and undefine __riscv_atomic > that used in the code to generate appropriate instructions > > Signed-off-by: Vladimir Kondratiev > --- > platform/generic/mips/objects.mk | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/platform/generic/mips/objects.mk b/platform/generic/mips/objects.mk > index a08c4c632997..84e21b7995bc 100644 > --- a/platform/generic/mips/objects.mk > +++ b/platform/generic/mips/objects.mk > @@ -5,4 +5,5 @@ > ifeq ($(PLATFORM_RISCV_XLEN), 64) > carray-platform_override_modules-$(CONFIG_PLATFORM_MIPS_P8700) += mips_p8700 > platform-objs-$(CONFIG_PLATFORM_MIPS_P8700) += mips/p8700.o mips/mips_warm_boot.o > +PLATFORM_RISCV_ISA = rv64imfdc_zalrsc_zicsr_zifencei > endif > > base-commit: 111738090c6cdf2d852717b3ad15b65e2085d237 -- opensbi mailing list opensbi@lists.infradead.org http://lists.infradead.org/mailman/listinfo/opensbi