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bh=MUThPKLeEk2SduZ96cfpZzQEtc1opoilxpVzXx1Z8ZU=; b=Q3eIP27FgZo8UtFTs2/H/ermzdvFH7h0x94u5D8+8FU3SgVJhKXvwwL2VxEaBjmR8qh9cm2/EtpmBZa4LvrZB11JdeKIgre4QkA8XQu7tR1O67eqTDVNkps+h/ZF2+ScNh1J52R+TfRWUB7F339bIHr8+DG0h7wQTCq0QdekBOlEa6kZdSn6SH6AT+BPu0j3J8JWto/qkeDeBCPhARYvGW5UEsl/5/xLgTJCroWUalBvhqY9eOZi+uDl2HVFMk3RvXiULjT+ZUdErcPiKH837vUKlQltdpco74Vl5yWyDnyYpQIWyNqh/6CUZ/zJ0V24SiwP/BV/DZO/YcZkUrMHZA== From: Jamin Lin To: =?iso-8859-1?Q?C=E9dric_Le_Goater?= , Peter Maydell , Steven Lee , Troy Lee , Andrew Jeffery , Joel Stanley , Pierrick Bouvier , Alistair Francis , Kevin Wolf , Hanna Reitz , "open list:ASPEED BMCs" , "open list:All patches CC here" , "open list:Block layer core" CC: Jamin Lin , Troy Lee , Kane Chen Subject: [PATCH v3 01/15] hw/arm/ast27x0: Start SSP in powered-off state to match hardware behavior Thread-Topic: [PATCH v3 01/15] hw/arm/ast27x0: Start SSP in powered-off state to match hardware behavior Thread-Index: AQHcpVqh2WqhyrWo80yQ1R5bJHHuZw== Date: Tue, 24 Feb 2026 06:55:59 +0000 Message-ID: <20260224065556.3847942-2-jamin_lin@aspeedtech.com> References: <20260224065556.3847942-1-jamin_lin@aspeedtech.com> In-Reply-To: <20260224065556.3847942-1-jamin_lin@aspeedtech.com> Accept-Language: zh-TW, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=aspeedtech.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c40f::6; envelope-from=jamin_lin@aspeedtech.com; helo=SEYPR02CU001.outbound.protection.outlook.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, SPF_HELO_PASS=-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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @aspeedtech.com) X-ZM-MESSAGEID: 1771916257983158500 Content-Type: text/plain; charset="utf-8" In the previous design, both the PSP and SSP were started together during SoC initialization. However, on real hardware, the SSP begins in a powered-= off state. The typical boot sequence involves the PSP powering up first, loading the SSP firmware binary into shared memory via DRAM remap, and then releasi= ng the SSP reset and enabling it through SCU control registers. To more accurately model this behavior in QEMU, this commit sets the "start-powered-off" property for the SSP's ARMv7M core. This change ensures the SSP remains off until explicitly enabled via the SCU, simulating the real-world flow where the PSP controls SSP boot through SCU interaction. Signed-off-by: Jamin Lin --- hw/arm/aspeed_ast27x0-ssp.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/arm/aspeed_ast27x0-ssp.c b/hw/arm/aspeed_ast27x0-ssp.c index 9b12ba6743..437fff3311 100644 --- a/hw/arm/aspeed_ast27x0-ssp.c +++ b/hw/arm/aspeed_ast27x0-ssp.c @@ -165,6 +165,13 @@ static void aspeed_soc_ast27x0ssp_realize(DeviceState = *dev_soc, Error **errp) qdev_connect_clock_in(armv7m, "cpuclk", s->sysclk); object_property_set_link(OBJECT(&a->armv7m), "memory", OBJECT(s->memory), &error_abort); + /* + * The SSP starts in a powered-down state and can be powered up + * by setting the SSP Control Register through the SCU + * (System Control Unit) + */ + object_property_set_bool(OBJECT(&a->armv7m), "start-powered-off", true, + &error_abort); sysbus_realize(SYS_BUS_DEVICE(&a->armv7m), &error_abort); =20 /* SDRAM */ --=20 2.43.0