mmc-utils writing RPMB key fails with general error

bluemonkeysrock — Tue, 29 Mar 2022 14:27:47 GMT

Hello,

I'm trying to program an RPMB key on iMX6DLSABRESD.

$mmc rpmb write-key /dev/mmcblk3rpmb rpmbkey RPMB operation failed, retcode 0x0001

I added extra logs on the mmc driver to track the commands/responses.

mmc rpmb write-key /dev/mmcblk3rpmb rpmbkey [ 110.970140] mmc_blk_ioctl_copy_from_user [ 110.974125] mmc_blk_ioctl_copy_from_user [ 110.978056] mmc_blk_ioctl_copy_from_user [ 110.982113] __mmc_blk_ioctl_cmd : cmd.opcode = 25 [ 110.986905] sdhci_finish_command: MMC_RSP_PRESENT [ 110.991618] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 110.998109] sdhci_finish_command: MMC_RSP_PRESENT [ 111.002823] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.008282] __mmc_blk_ioctl_cmd : mmc_blk_part_switch ret 0 [ 111.013902] __mmc_blk_ioctl_cmd : copy the 'Reliable Write' bit [ 111.019866] sdhci_finish_command: MMC_RSP_PRESENT [ 111.024576] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.030056] __mmc_blk_ioctl_cmd : cmd.resp[0] = 00000900 [ 111.035420] sdhci_finish_command: MMC_RSP_PRESENT [ 111.040131] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.045580] __mmc_blk_ioctl_cmd : return 0x0 [ 111.049857] mmc_blk_issue_drv_op : (0) __mmc_blk_ioctl_cmd ret 0x0 [ 111.056069] __mmc_blk_ioctl_cmd : cmd.opcode = 25 [ 111.056076] __mmc_blk_ioctl_cmd : mmc_blk_part_switch ret 0 [ 111.056082] __mmc_blk_ioctl_cmd : copy the 'Reliable Write' bit [ 111.072331] sdhci_finish_command: MMC_RSP_PRESENT [ 111.077039] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.082514] __mmc_blk_ioctl_cmd : cmd.resp[0] = 00000900 [ 111.087880] sdhci_finish_command: MMC_RSP_PRESENT [ 111.092591] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.098264] __mmc_blk_ioctl_cmd : return 0x0 [ 111.102545] mmc_blk_issue_drv_op : (1) __mmc_blk_ioctl_cmd ret 0x0 [ 111.108764] __mmc_blk_ioctl_cmd : cmd.opcode = 18 [ 111.108770] __mmc_blk_ioctl_cmd : mmc_blk_part_switch ret 0 [ 111.108774] __mmc_blk_ioctl_cmd : copy the 'Reliable Write' bit [ 111.108831] sdhci_finish_command: MMC_RSP_PRESENT [ 111.129687] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.135180] __mmc_blk_ioctl_cmd : cmd.resp[0] = 00000900 [ 111.140526] sdhci_finish_command: MMC_RSP_PRESENT [ 111.145233] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.150671] __mmc_blk_ioctl_cmd : return 0x0 [ 111.154964] mmc_blk_issue_drv_op : (2) __mmc_blk_ioctl_cmd ret 0x0 [ 111.154991] sdhci_finish_command: MMC_RSP_PRESENT [ 111.165859] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.172312] sdhci_finish_command: MMC_RSP_PRESENT [ 111.177021] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.182457] mmc_blk_issue_drv_op : mq_rq->drv_op_result ret 0x0 [ 111.188422] mmc_blk_ioctl_copy_to_user [ 111.188672] sdhci_finish_command: MMC_RSP_PRESENT [ 111.192183] mmc_blk_ioctl_copy_to_user [ 111.196883] sdhci_finish_command: cmd->resp[0]=0x00000900 [ 111.196941] sdhci_finish_command: MMC_RSP_PRESENT [ 111.200670] mmc_blk_ioctl_copy_to_user

Here's the uSDHC configuration from device tree. I'm running linux 5.4

usdhc4: usdhc@219c000 { compatible = "fsl,imx6q-usdhc"; reg = <0x0219c000 0x4000>; interrupts = <0 25 IRQ_TYPE_LEVEL_HIGH>; clocks = <&clks IMX6QDL_CLK_USDHC4>, <&clks IMX6QDL_CLK_USDHC4>, <&clks IMX6QDL_CLK_USDHC4>; clock-names = "ipg", "ahb", "per"; bus-width = <4>; status = "disabled"; }; pinctrl_usdhc4: usdhc4grp { fsl,pins = < MX6QDL_PAD_SD4_CMD__SD4_CMD 0x17059 MX6QDL_PAD_SD4_CLK__SD4_CLK 0x10059 MX6QDL_PAD_SD4_DAT0__SD4_DATA0 0x17059 MX6QDL_PAD_SD4_DAT1__SD4_DATA1 0x17059 MX6QDL_PAD_SD4_DAT2__SD4_DATA2 0x17059 MX6QDL_PAD_SD4_DAT3__SD4_DATA3 0x17059 MX6QDL_PAD_SD4_DAT4__SD4_DATA4 0x17059 MX6QDL_PAD_SD4_DAT5__SD4_DATA5 0x17059 MX6QDL_PAD_SD4_DAT6__SD4_DATA6 0x17059 MX6QDL_PAD_SD4_DAT7__SD4_DATA7 0x17059 >; }; &usdhc4 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_usdhc4>; bus-width = <8>; non-removable; no-1-8-v; auto-cmd23-broken; status = "okay"; };

What am I missing?
Thanks for any insight on the matter.

Regards,

Re: mmc-utils writing RPMB key fails with general error

BiyongSUN — Wed, 30 Mar 2022 05:05:59 GMT

How long is the RPMB key length you are using?

Have you read the jedec spec?

The key/MAC must be 32Byte long.

Your question is about emmc chip, not the usdhc controller of i.MX.

JEDEC Standard No. 84-B51

eMMC RPMB Enhance and GP
https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/eMMC-RPMB-Enhance-and-GP/ta-p/1099818

Re: mmc-utils writing RPMB key fails with general error

bluemonkeysrock — Wed, 30 Mar 2022 06:47:28 GMT

The key is 32byte long and I have read the emmc spec.
For writing RPMB key it said : "If some other error occurs during Authentication Key programming then returned result is 0x01 (General Failure)."

That same error occurs when trying to rewrite the key.

$ mmc rpmb write-key /dev/mmcblk0rpmb real_rpmbkey => no error $ mmc rpmb write-key /dev/mmcblk0rpmb fake_rpmbkey RPMB operation failed, retcode 0x0001

Is there a way to verify whether the key is written or some other issue with the emmc?

Thanks,

Re: mmc-utils writing RPMB key fails with general error

BiyongSUN — Thu, 31 Mar 2022 09:03:47 GMT

The RPMB key is OTP.

I believe you can use the key now.

And please read the document I wrote from page 4.

Re: mmc-utils writing RPMB key fails with general error

bluemonkeysrock — Thu, 31 Mar 2022 11:04:04 GMT

For that eMMC, I can use the key to write/read with no issues.
On another one :

$ mmc rpmb read-counter /dev/mmcblk3rpmb RPMB operation failed, retcode 0x0007 => RPMB_ERR_NO_KEY $ mmc rpmb write-key /dev/mmcblk3rpmb rpmbkey RPMB operation failed, retcode 0x0001 => RPMB_ERR_GENERAL

I cannot read the counter value because no key is written and general error when I try to write one.

Thanks you,

Re: mmc-utils writing RPMB key fails with general error

BiyongSUN — Fri, 01 Apr 2022 01:00:19 GMT

do you have the problem with read-block/write-block?

Finish the write-block, then try read-counter, how's the result?

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mmc-utils writing RPMB key fails with general error

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Re: mmc-utils writing RPMB key fails with general error

Re: mmc-utils writing RPMB key fails with general error

Re: mmc-utils writing RPMB key fails with general error

Re: mmc-utils writing RPMB key fails with general error