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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1460422/am62p-how-to-modify-the-emmc-frequency-to-125mhz-in-uboot-or-kernel-code
工具与软件：
尊敬的工程师 TI
您好！
您能在此处列出您正在执行的确切步骤吗？
谢谢！
Prashant
我们使用的当前命令为： devmem2 0x682088 w 0x800f
但我在 AM62P 数据表中找不到此寄存器的定义、这只是您同事建议让我们配置此寄存器。
我希望能就如何在引导代码或内核代码中配置 eMMC 频率提供一些建议。
此致
您能否尝试使用以下补丁将 eMMC 频率降低到125MHz？
diff --git a/arch/arm64/boot/dts/ti/k3-am62p-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62p-main.dtsi index f8915d7a9c6b..796329c41d7d 100644 --- a/arch/arm64/boot/dts/ti/k3-am62p-main.dtsi +++ b/arch/arm64/boot/dts/ti/k3-am62p-main.dtsi @@ -612,6 +612,7 @@ sdhci0: mmc@fa10000 { clock-names = "clk_ahb", "clk_xin"; assigned-clocks = <&k3_clks 57 2>; assigned-clock-parents = <&k3_clks 57 4>; + assigned-clock-rates = <125000000>; bus-width = <8>; mmc-ddr-1_8v; mmc-hs200-1_8v;
diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c index 1062f9d62b05..5e89e4b8de01 100644 --- a/drivers/mmc/host/sdhci_am654.c +++ b/drivers/mmc/host/sdhci_am654.c @@ -641,7 +641,8 @@ static struct sdhci_ops sdhci_j721e_8bit_ops = { static const struct sdhci_pltfm_data sdhci_j721e_8bit_pdata = { .ops = &sdhci_j721e_8bit_ops, - .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12, + .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 | + SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, };
此致、
您好、
在我按您提供的方式修改了修补程序并使用 k3conf 转储进行查看后、似乎修改成功了。 感谢您的帮助！ 在：之前
在：μ s 后
Bruce
Prashant、您好！
是否可以通过这种方式将 eMMC 更改为任意频率？
不是 Tony、它必须采用其 PLL 或分频器允许的频率。
