topic Re: mmc_select_hs200 failed, error -74 in i.MX Processors

mmc_select_hs200 failed, error -74

gjfme — Thu, 29 Apr 2021 11:39:59 GMT

Hi all:

我们imx6ull 主板在用mfgtool 下载到 Sending partition shell 报错，

mmc1: MAN_BKOPS_EN bit is not set mmc1: mmc_select_hs200 failed, error -74 : switch to mmc1 failed mmc1: new MMC card at address 0001 mmcblk1: mmc1:0001 P1XXXX 7.20 GiB mmcblk1boot0: mmc1:0001 P1XXXX partition 1 2.00 MiB mmcblk1boot1: mmc1:0001 P1XXXX partition 2 2.00 MiB mmcblk1rpmb: mmc1:0001 P1XXXX partition 3 128 KiB Unable to handle kernel NULL pointer dereference at virtual address 00000008 pgd = 80004000 [00000008] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 63 Comm: file-storage Not tainted 4.1.15-2.1.0+ #1 Hardware name: Freescale i.MX6 Ultralite (Device Tree) task: a831d7c0 ti: a8410000 task.ti: a8410000 PC is at fsg_main_thread+0xa7c/0x1f80 LR is at fsg_main_thread+0xa7c/0x1f80 pc : [<80454eb4>] lr : [<80454eb4>] psr: 20000113 sp : a8411ee8 ip : a831d7c0 fp : 43425355 r10: a830bd00 r9 : 53425355 r8 : a8410000 r7 : a83bce00 r6 : a8411f28 r5 : 00000000 r4 : 80a55530 r3 : 80a55568 r2 : 00000001 r1 : 00000000 r0 : 80a55548 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c53c7d Table: 8000406a DAC: 00000015 Process file-storage (pid: 63, stack limit = 0xa8410210) Stack: (0xa8411ee8 to 0xa8412000) 1ee0: 00000000 808d7ca0 a830bd34 00055302 ab732800 a831d7c0 1f00: 00000000 00000000 80a55548 00000000 c0855000 a831da6c a8411f54 806f03ac 1f20: 00000004 806ecc18 00000000 a831d7c0 8005c450 a8411f34 a8411f34 a83bda40 1f40: a830bd00 00000000 a83bda40 a830bd00 80454438 00000000 00000000 00000000 1f60: 00000000 8004557c 55c355c3 00000000 809bd800 a830bd00 00000000 00000000 1f80: a8411f80 a8411f80 00000000 00000000 a8411f90 a8411f90 a8411fac a83bda40 1fa0: 800454a0 00000000 00000000 8000f468 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 55c355c3 55c355c3 [<80454eb4>] (fsg_main_thread) from [<8004557c>] (kthread+0xdc/0xf4) [<8004557c>] (kthread) from [<8000f468>] (ret_from_fork+0x14/0x2c) Code: e5b35038 e1550003 03a05000 eb0a667e (e5953008) g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage

请问是什么问题？我在dts 中注释掉了 pinctrl-2 = <&pinctrl_usdhc2_8bit_200mhz>;

mmc_select_hs200 failed, error -74 这个问题是没有了，但是下面的问题还会有。请问怎么回事？

Re: mmc_select_hs200 failed, error -74

weidong_sun — Fri, 30 Apr 2021 03:16:45 GMT

Hi,

Due to hardware limitations, the usdhc clock is constrainted to be 132MHz.

&usdhc1 {
compatible = "fsl,imx6ull-usdhc", "fsl,imx6sx-usdhc";
assigned-clocks = <&clks IMX6UL_CLK_USDHC1_SEL>, <&clks IMX6UL_CLK_USDHC1>;
assigned-clock-parents = <&clks IMX6UL_CLK_PLL2_PFD2>;
assigned-clock-rates = <0>, <132000000>;
};

&usdhc2 {
compatible = "fsl,imx6ull-usdhc", "fsl,imx6sx-usdhc";
assigned-clocks = <&clks IMX6UL_CLK_USDHC2_SEL>, <&clks IMX6UL_CLK_USDHC2>;
assigned-clock-parents = <&clks IMX6UL_CLK_PLL2_PFD2>;
assigned-clock-rates = <0>, <132000000>;
};

The clock speed's max value can't exceed 150MHz.

[note]

1. For High speed mode, uSDHC IO voltage must be 1.8V.

2. if you are using 3.3V IO, The max value of uSDHC clock speed can't exceed 50MHz

3. you can add these 2 members to usdhc node in device tree for debug purpose:

......

no-1-8-v; /* optional: if 3.3V IO is used, add it ,please! ; if 1.8V IO is used, comment it, please! */
max-frequency=<500000>; /* you can modify the value duiring debugging it. for example , 100M, 120M, 132M etc*/

......

Have a nice day!

B.R,

weidong

Re: mmc_select_hs200 failed, error -74

gjfme — Fri, 30 Apr 2021 06:19:52 GMT

Hi weidong:

感谢解答