[PATCH 2/3] arch/arm/boards/avnet-zedboard/lowlevel.c: added SDIO clk frequency configuration
Gwenhael Goavec-Merou
gwenj at trabucayre.com
Sun Jul 6 22:53:30 PDT 2025
From: Gwenhael Goavec-Merou <gwenhael.goavec-merou at trabucayre.com>
As mentionned in [1] MMC sometime fails to be initialized/ is not
working with this type of error:
arasan-sdhci e0100000.mmc at e0100000.of: registered as mmc0
malloc space: 0x17e00000 -> 0x1fdfffff (size 128 MiB)
arasan-sdhci e0100000.mmc at e0100000.of: error while transferring data for command 6
arasan-sdhci e0100000.mmc at e0100000.of: state = 0x01ff0202 , interrupt = 0x00208000
mmc0: Card's startup fails with -74
barebox-environment chosen:environment-sd.of: probe failed: No such file or directory
environment load /dev/env0: No such file or directory
This patch adds SDIO clck configuration allowing to have a valid MMC
clock frequency.
[1] https://lore.barebox.org/barebox/VI1PR02MB4429606E3B06D0F53D2B4175AB4DA@VI1PR02MB4429.eurprd02.prod.outlook.com/T/#m1cb8598da4741c0b7a41944e1aecef373dd74319
Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou at trabucayre.com>
---
arch/arm/boards/avnet-zedboard/lowlevel.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boards/avnet-zedboard/lowlevel.c b/arch/arm/boards/avnet-zedboard/lowlevel.c
index 605aab783a..b7a98f5a82 100644
--- a/arch/arm/boards/avnet-zedboard/lowlevel.c
+++ b/arch/arm/boards/avnet-zedboard/lowlevel.c
@@ -241,6 +241,7 @@ static void avnet_zedboard_ps7_init(void)
/* poor mans clkctrl */
writel(0x00001403, ZYNQ_CLOCK_CTRL_BASE + ZYNQ_UART_CLK_CTRL);
writel(0x00000101, ZYNQ_CLOCK_CTRL_BASE + ZYNQ_LQSPI_CLK_CTRL);
+ writel(0x00001401, ZYNQ_CLOCK_CTRL_BASE + ZYNQ_SDIO_CLK_CTRL);
/* GEM0 */
writel(0x00000001, 0xf8000138);
--
2.47.2
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