From: Jamin Lin Date: Wed, 18 Jun 2025 08:00:04 +0000 (+0800) Subject: hw/misc/aspeed_sdmc: Skipping dram_init in u-boot for AST2700 X-Git-Tag: v10.1.0-rc0~34^2~10 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51ac481bff88723ef4c101925082fab03bba200a;p=thirdparty%2Fqemu.git hw/misc/aspeed_sdmc: Skipping dram_init in u-boot for AST2700 On AST2700 SoC, QEMU now sets BIT6 in VGA0 SCRATCH register to indicate that DDR training has completed, thus skipping the dram_init(). To align with the recent U-Boot changes, where the Main Control Register's BIT16 is checked to skip the dram_init() process, this patch sets BIT16 in the SDMC Main Control Register at reset time. This allows both the main U-Boot stage to correctly detect and bypass DRAM initialization when running under QEMU. Reference: - QEMU: https://github.com/qemu/qemu/commit/2d082fea485ee455a70ed3e963cdf9a70f34858a - U-Boot: https://github.com/AspeedTech-BMC/u-boot/commit/94e5435504fb0d8888f5c1bfd3fa284cdd6aaf9b Signed-off-by: Jamin Lin Reviewed-by: Cédric Le Goater Link: https://lore.kernel.org/qemu-devel/20250618080006.846355-2-jamin_lin@aspeedtech.com Signed-off-by: Cédric Le Goater --- diff --git a/hw/misc/aspeed_sdmc.c b/hw/misc/aspeed_sdmc.c index f04d9930dd7..dff7cc362d3 100644 --- a/hw/misc/aspeed_sdmc.c +++ b/hw/misc/aspeed_sdmc.c @@ -570,6 +570,9 @@ static void aspeed_2700_sdmc_reset(DeviceState *dev) /* Set ram size bit and defaults values */ s->regs[R_MAIN_CONF] = asc->compute_conf(s, 0); + /* Skipping dram init */ + s->regs[R_MAIN_CONTROL] = BIT(16); + if (s->unlocked) { s->regs[R_2700_PROT] = PROT_UNLOCKED; }