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[86.9.131.95]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3825fbc3defsm5032463f8f.70.2024.11.23.02.38.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 Nov 2024 02:38:41 -0800 (PST) From: Stafford Horne To: QEMU Development Cc: Ahmad Fatoum , Stafford Horne , Jia Liu Subject: [PATCH 1/2] hw/openrisc/openrisc_sim: keep serial@90000000 as default Date: Sat, 23 Nov 2024 10:38:26 +0000 Message-ID: <20241123103828.3157128-2-shorne@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241123103828.3157128-1-shorne@gmail.com> References: <20241123103828.3157128-1-shorne@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::429; envelope-from=shorne@gmail.com; helo=mail-wr1-x429.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, FREEMAIL_FROM=0.001, 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 From: Ahmad Fatoum We used to only have a single UART on the platform and it was located at address 0x90000000. When the number of UARTs was increased to 4, the first UART remained at it's location, but instead of being the first one to be registered, it became the last. This caused QEMU to pick 0x90000300 as the default UART, which broke software that hardcoded the address of 0x90000000 and expected it's output to be visible when the user configured only a single console. This caused regressions[1] in the barebox test suite when updating to a newer QEMU. As there seems to be no good reason to register the UARTs in inverse order, let's register them by ascending address, so existing software can remain oblivious to the additional UART ports. Changing the order of uart registration alone breaks Linux which was choosing the UART at 0x90000300 as the default for ttyS0. To fix Linux we fix two things in the device tree: 1. Define stdout-path only one time for the first registerd UART instead of incorrectly defining for each UART. 2. Change the UART alias name from 'uart0' to 'serial0' as almost all Linux tty drivers look for an alias starting with "serial". [1]: https://lore.barebox.org/barebox/707e7c50-aad1-4459-8796-0cc54bab32e2@pengutronix.de/T/#m5da26e8a799033301489a938b5d5667b81cef6ad Fixes: 777784bda468 ("hw/openrisc: support 4 serial ports in or1ksim") Signed-off-by: Ahmad Fatoum [stafford: Change to serial0 alias and update change message] Signed-off-by: Stafford Horne --- hw/openrisc/openrisc_sim.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/hw/openrisc/openrisc_sim.c b/hw/openrisc/openrisc_sim.c index 9fb63515ef..5ec9172ccf 100644 --- a/hw/openrisc/openrisc_sim.c +++ b/hw/openrisc/openrisc_sim.c @@ -250,7 +250,7 @@ static void openrisc_sim_serial_init(Or1ksimState *state, hwaddr base, void *fdt = state->fdt; char *nodename; qemu_irq serial_irq; - char alias[sizeof("uart0")]; + char alias[sizeof("serial0")]; int i; if (num_cpus > 1) { @@ -265,7 +265,7 @@ static void openrisc_sim_serial_init(Or1ksimState *state, hwaddr base, serial_irq = get_cpu_irq(cpus, 0, irq_pin); } serial_mm_init(get_system_memory(), base, 0, serial_irq, 115200, - serial_hd(OR1KSIM_UART_COUNT - uart_idx - 1), + serial_hd(uart_idx), DEVICE_NATIVE_ENDIAN); /* Add device tree node for serial. */ @@ -277,10 +277,13 @@ static void openrisc_sim_serial_init(Or1ksimState *state, hwaddr base, qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency", OR1KSIM_CLK_MHZ); qemu_fdt_setprop(fdt, nodename, "big-endian", NULL, 0); - /* The /chosen node is created during fdt creation. */ - qemu_fdt_setprop_string(fdt, "/chosen", "stdout-path", nodename); - snprintf(alias, sizeof(alias), "uart%d", uart_idx); + if (uart_idx == 0) { + /* The /chosen node is created during fdt creation. */ + qemu_fdt_setprop_string(fdt, "/chosen", "stdout-path", nodename); + } + snprintf(alias, sizeof(alias), "serial%d", uart_idx); qemu_fdt_setprop_string(fdt, "/aliases", alias, nodename); + g_free(nodename); }