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[71.212.39.66]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-220d5584dccsm46215905ad.205.2025.02.15.10.24.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 15 Feb 2025 10:24:06 -0800 (PST) Message-ID: Date: Sat, 15 Feb 2025 10:24:05 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/5] target/rx: Load reset vector from memory after first run To: Keith Packard , qemu-devel@nongnu.org, Peter Maydell References: <20250215021654.1786679-1-keithp@keithp.com> <20250215021654.1786679-5-keithp@keithp.com> Content-Language: en-US From: Richard Henderson In-Reply-To: <20250215021654.1786679-5-keithp@keithp.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62d; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 2/14/25 18:16, Keith Packard via wrote: > The ROM images all get deleted as they've been loaded to memory, so we > can't go fetch the reset vector from there. Instead, fetch it from > memory. To make that work, we need to execute the delayed mmu setup > function tcg_commit_cpu as that wires up memory dispatching. > > Signed-off-by: Keith Packard > --- > target/rx/cpu.c | 24 +++++++++++++++++++----- > 1 file changed, 19 insertions(+), 5 deletions(-) IIRC this is where the cpu needs to be part of the 3-phase reset process. ROM gets reset too, but with unspecified ordering wrt the cpu itself. By delaying the load of the reset vector to the reset_exit phase, you can always load from rom. I believe Peter most recently handled a very similar situation with armv7m. r~