U-boot iMX8MM eMMC 5.1 issue with custom device tree

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U-boot iMX8MM eMMC 5.1 issue with custom device tree

474件の閲覧回数
xboborx
Contributor I
Hello,
 
we are working on developing a device using the SoM FETMX8MM from Forlinx, based on the iMX8MM SoC. For our project, we need a newer kernel (6+) than what the manufacturer provides, so we've been building a custom U-Boot.
 
Unfortunately, Forlinx has closed-source U-Boot, and we need kernel version 6+. We've had to create a custom DTS file by decompiling the DTB from the binary image since we don't have the original DTS. U-Boot was built from the GitHub repository uboot-imx (branch lf_v2022.04).
 
The issue we're facing is that the eMMC 5.1 (FORSEE FEMDRW008G-88A39) on the SoM isn't initializing. Power management is handled by the ROHM BD71847A. Our investigation shows that the eMMC is connected to the USDHC3 data bus.
 
When using the specified DT configurations
-----
&i2c1 {
clock-frequency = <400000>;
pinctrl-names = "default", "gpio";
pinctrl-0 = <&pinctrl_i2c1>;
pinctrl-1 = <&pinctrl_i2c1_gpio>;
scl-gpios = <&gpio5 14 GPIO_ACTIVE_HIGH>;
sda-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
status = "okay";
 
pmic_rohm: pmic@4b {
compatible = "rohm,bd71847";
reg = <0x4b>;
pinctrl-0 = <&pinctrl_pmic>;
pinctrl-names = "default";
interrupt-parent = <&gpio1>;
interrupts = GPIO_ACTIVE_LOW>;
rohm,reset-snvs-powered;
 
#clock-cells = <0>;
clocks = <&osc_32k 0>;
clock-output-names = "clk-32k-out";
 
gpo {
rohm,drv = <0x0c>;
};
 
regulators {
#address-cells = <0x01>;
#size-cells = <0x00>;
bd71837,pmic-buck2-dvs-voltage = <0xf4240 0xdbba0 0x00>;
bd71837,pmic-buck2-uses-i2c-dvs;
 
buck1_reg: BUCK1 {
regulator-name = "BUCK1";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1300000>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <1250>;
};
 
buck2_reg: BUCK2 {
regulator-name = "BUCK2";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1300000>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <1250>;
rohm,dvs-run-voltage = <1000000>;
rohm,dvs-idle-voltage = <900000>;
};
 
buck3_reg: BUCK3 {
// BUCK5 in datasheet
regulator-name = "BUCK3";
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1350000>;
regulator-boot-on;
regulator-always-on;
};
 
buck4_reg: BUCK4 {
// BUCK6 in datasheet
regulator-name = "BUCK4";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3300000>;
regulator-boot-on;
regulator-always-on;
};
 
buck5_reg: BUCK5 {
// BUCK7 in datasheet
regulator-name = "BUCK5";
regulator-min-microvolt = <1605000>;
regulator-max-microvolt = <1995000>;
regulator-boot-on;
regulator-always-on;
};
 
buck6_reg: BUCK6 {
// BUCK8 in datasheet
regulator-name = "BUCK6";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1400000>;
regulator-boot-on;
regulator-always-on;
};
 
ldo1_reg: LDO1 {
regulator-name = "LDO1";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3300000>;
regulator-boot-on;
regulator-always-on;
};
 
ldo2_reg: LDO2 {
regulator-name = "LDO2";
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <900000>;
regulator-boot-on;
regulator-always-on;
};
 
ldo3_reg: LDO3 {
regulator-name = "LDO3";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-boot-on;
regulator-always-on;
};
 
ldo4_reg: LDO4 {
regulator-name = "LDO4";
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};
 
ldo6_reg: LDO6 {
regulator-name = "LDO6";
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1800000>;
regulator-boot-on;
regulator-always-on;
};
};
};
 
};
-----
/* EMMC */
&usdhc3 {
   assigned-clocks = <0x04 0x1b5>;
   clocks = <0x04 0x00 0x04 0x77 0x04 0x1b5>;
       assigned-clocks = <&clk IMX8MM_CLK_USDHC3_ROOT>;
       assigned-clock-rates = <400000000>;
       bus-width = <8>;
       keep-power-in-suspend;
       pinctrl-names = "default", "state_100mhz", "state_200mhz";
       pinctrl-0 = <&pinctrl_usdhc3>;
       pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
       pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
       non-removable;
       status = "okay";
};
-----
pinctrl_usdhc3: usdhc3grp {
fsl,pins = <
MX8MM_IOMUXC_NAND_WE_B_USDHC3_CLK 0x40000190
MX8MM_IOMUXC_NAND_WP_B_USDHC3_CMD 0x1d0
MX8MM_IOMUXC_NAND_DATA04_USDHC3_DATA0 0x1d0
MX8MM_IOMUXC_NAND_DATA05_USDHC3_DATA1 0x1d0
MX8MM_IOMUXC_NAND_DATA06_USDHC3_DATA2 0x1d0
MX8MM_IOMUXC_NAND_DATA07_USDHC3_DATA3 0x1d0
MX8MM_IOMUXC_NAND_RE_B_USDHC3_DATA4 0x1d0
MX8MM_IOMUXC_NAND_CE2_B_USDHC3_DATA5 0x1d0
MX8MM_IOMUXC_NAND_CE3_B_USDHC3_DATA6 0x1d0
MX8MM_IOMUXC_NAND_CLE_USDHC3_DATA7 0x1d0
MX8MM_IOMUXC_NAND_CE1_B_USDHC3_STROBE 0x190
>;
};
 
pinctrl_usdhc3_100mhz: usdhc3-100mhzgrp {
fsl,pins = <
MX8MM_IOMUXC_NAND_WE_B_USDHC3_CLK 0x40000194
MX8MM_IOMUXC_NAND_WP_B_USDHC3_CMD 0x1d4
MX8MM_IOMUXC_NAND_DATA04_USDHC3_DATA0 0x1d4
MX8MM_IOMUXC_NAND_DATA05_USDHC3_DATA1 0x1d4
MX8MM_IOMUXC_NAND_DATA06_USDHC3_DATA2 0x1d4
MX8MM_IOMUXC_NAND_DATA07_USDHC3_DATA3 0x1d4
MX8MM_IOMUXC_NAND_RE_B_USDHC3_DATA4 0x1d4
MX8MM_IOMUXC_NAND_CE2_B_USDHC3_DATA5 0x1d4
MX8MM_IOMUXC_NAND_CE3_B_USDHC3_DATA6 0x1d4
MX8MM_IOMUXC_NAND_CLE_USDHC3_DATA7 0x1d4
MX8MM_IOMUXC_NAND_CE1_B_USDHC3_STROBE 0x194
>;
};
 
pinctrl_usdhc3_200mhz: usdhc3-200mhzgrp {
fsl,pins = <
MX8MM_IOMUXC_NAND_WE_B_USDHC3_CLK 0x40000196
MX8MM_IOMUXC_NAND_WP_B_USDHC3_CMD 0x1d6
MX8MM_IOMUXC_NAND_DATA04_USDHC3_DATA0 0x1d6
MX8MM_IOMUXC_NAND_DATA05_USDHC3_DATA1 0x1d6
MX8MM_IOMUXC_NAND_DATA06_USDHC3_DATA2 0x1d6
MX8MM_IOMUXC_NAND_DATA07_USDHC3_DATA3 0x1d6
MX8MM_IOMUXC_NAND_RE_B_USDHC3_DATA4 0x1d6
MX8MM_IOMUXC_NAND_CE2_B_USDHC3_DATA5 0x1d6
MX8MM_IOMUXC_NAND_CE3_B_USDHC3_DATA6 0x1d6
MX8MM_IOMUXC_NAND_CLE_USDHC3_DATA7 0x1d6
MX8MM_IOMUXC_NAND_CE1_B_USDHC3_STROBE 0x196
>;
};
-----
 
We'll see in cli:
 
u-boot=> mmc dev 2
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:8
                ARG                      0x000001aa
                RET                      -110
CMD_SEND:55
                ARG                      0x00000000
                RET                      -110
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:8
                ARG                      0x000001aa
                RET                      -110
CMD_SEND:55
                ARG                      0x00000000
                RET                      -110
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:1
                ARG                      0x00000000
                MMC_RSP_R3,4             0x00ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x00ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x00ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x00ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x00ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x00ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x40ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0x40ff8080 
CMD_SEND:1
                ARG                      0x40360080
                MMC_RSP_R3,4             0xc0ff8080 
CMD_SEND:2
                ARG                      0x00000000
                MMC_RSP_R2               0xd6010338 
                                         0x38413339 
                                         0x3811bc91 
                                         0x7aa07900 
 
                                        DUMPING DATA
                                        000 - d6 01 03 38 
                                        004 - 38 41 33 39 
                                        008 - 38 11 bc 91 
                                        012 - 7a a0 79 00 
CMD_SEND:3
                ARG                      0x00010000
                MMC_RSP_R1,5,6,7         0x00000500 
CMD_SEND:9
                ARG                      0x00010000
                MMC_RSP_R2               0xd0ffff32 
                                         0x9f5903ff 
                                         0xffffffe7 
                                         0x96400000 
 
                                        DUMPING DATA
                                        000 - d0 ff ff 32 
                                        004 - 9f 59 03 ff 
                                        008 - ff ff ff e7 
                                        012 - 96 40 00 00 
CMD_SEND:7
                ARG                      0x00010000
                MMC_RSP_R1,5,6,7         0x00000700 
CMD_SEND:8
                ARG                      0x00000000
                MMC_RSP_R1,5,6,7         0x00000900 
CMD_SEND:6
                ARG                      0x03b70200
                MMC_RSP_R1b              0x00000900 
CMD_SEND:13
                ARG                      0x00010000
                MMC_RSP_R1,5,6,7         0x00000900 
CURR STATE:4
CMD_SEND:6
                ARG                      0x03b90100
                MMC_RSP_R1b              0x00000900 
CMD_SEND:8
                ARG                      0x00000000
                MMC_RSP_R1,5,6,7         0x00000900 
CMD_SEND:6
                ARG                      0x03b78600
                MMC_RSP_R1b              0x00000900 
CMD_SEND:13
                ARG                      0x00010000
                MMC_RSP_R1,5,6,7         0x00000900 
CURR STATE:4
CMD_SEND:6
                ARG                      0x03b90300
                MMC_RSP_R1b              0x00000900 
CMD_SEND:13
                ARG                      0x00010000
                MMC_RSP_R1,5,6,7         0x00000900 
CURR STATE:4
CMD_SEND:8
                ARG                      0x00000000
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70000
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70000
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70000
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70000
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70200
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70200
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70200
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70200
                RET                      -110
CMD_SEND:6
                ARG                      0x03b70000
                RET                      -110
it gets stuck in a loop. Initially, the ERR -100 on CMD8 and CMD55 seems suspicious, but soon after another CMD0, we receive a CMD1 response of 0x00ff8080, regardless of the argument. According to the JEDEC standard for previous versions, this response could mean that the device is busy or the voltage range is not valid.
 
Could you please suggest us what might be causing this behavior? 
Unfortunately, we don't have access to the SoM schematic, so we're relying on intuition here.
 
P.S. The responses to CMD9 and CMD2 seem valid, according to the eMMC datasheet.
 
Thanks a lot in advance.
 
Best regards

 

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JorgeCas
NXP TechSupport
NXP TechSupport

Hello,

I suggest you try to check the connection of eMMC with the processor to configure the device tree according to your design.

Also, I suggest you take a look on our reference device tree used in U-boot.

imx8mm.dtsi

imx8mm-evk.dts

Best regards.

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xboborx
Contributor I

Hi, JorgeCas.

Thanks for your response. To create a custom device tree, I used a modified imx8mm-evk.dtsi (with the main properties specified at the top), which includes the unchanged imx8mm.dtsi.

Is it possible to pinpoint the issue (clock, power, etc.) from the eMMC logs? Are there any alternative debugging methods available in U-Boot?

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JorgeCas
NXP TechSupport
NXP TechSupport

Hello,

As you mentioned, the issue is related to power or device is busy. I think you should try changing regulators definitions in device tree. Since there is no documentation about your board you should experiment with these values.

Best regards.

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