[U-Boot] U-Boot 2018.09 imx6ull mass storage issue

19 Dec 2018


      Hello,
I try to load some images from USB flash drive. When issuing/usb 
start/with the flash drive on to the first USB I get some following 
information:
U-Boot 2018.09-36904-gae57ffc-dirty (Dec 18 2018 - 23:00:37 +0100)
CPU: Freescale i.MX6ULL rev1.1 792 MHz (running at 396 MHz)
    CPU: Industrial temperature grade (-40C to 105C) at 49C
    Reset cause: POR
    Model: SomLabs i.MX6 ULL Visionsom
    Board: SomLabs visionsom 6ull
    DRAM: 512 MiB
    NAND: 512 MiB
    Loading Environment from NAND... *** Warning - bad CRC, using
    default environmet
Video: 800x480x24
    In: serial
    Out: serial
    Err: serial
    Net: FEC0 [PRIME]
    Warning: FEC0 (eth0) using random MAC address - 46:79:2e:d4:3f:03
Somlabs iMX6ULL # usb start
    starting USB...
    USB0: USB EHCI 1.00
    USB1: USB EHCI 1.00
    scanning bus 0 for devices... 1 USB Device(s) found
    scanning bus 1 for devices... EHCI timed out on TD - token=0x80008d80
USB device not accepting new address (error=22)
    1 USB Device(s) found
    scanning usb for storage devices... 0 Storage Device(s) found
    Somlabs iMX6ULL #
I'm trying to find the solution on different forums but without success. 
Hardware is OK because on U-Boot from 2017.03 it works well. Here is a 
list what I'm trying
1. setenv usb_pgood_delay 10000
 2. Changed max_xfer_blk to 32768, 65535 etc.
 3. Adding extra lines into usb_storage.c
int gave_extra_time = 0;
...
if ((srb->sense_buf[2] == 0x02) &&
    (srb->sense_buf[12] == 0x3a))
    return -1;
...
/* If the status is "Not Ready - becoming ready", give it
    * more time. Linux issues a spinup command (once) and gives
    * it 100 seconds. */
    if (srb->sense_buf[2] == 0x02 && srb->sense_buf[12] == 0x04 &&
    gave_extra_time == 0)
    gave_extra_time = retries = 1000; /* Allow 10 seconds. */
    ...
mdelay(100);
    } while (retries--);
The problem is with disappearing power supply on USB. The flash drive 
blinks shortly and disabled at all then. Nothing helps so far. On U-Boot 
2017.03 when I issue/usb//start/, the flash drive blinks 2 times and LED 
in it start beam constantly. Of course, all USB flash drive operations 
working well.
U-Boot is available at GitHub - SoMLabs/somlabs-uboot-imx 
https://community.nxp.com/external-link.jspa?url=https%3A%2F%2Fgithub.com%2FSoMLabs%2Fsomlabs-uboot-imx - 
branch 2018.09 if someone wants to check parameters (draft version)
I added some parameters related with usb and mass storage
form defconfig
CONFIG_CMD_USB=y
CONFIG_USB=y
CONFIG_DM_USB=y
CONFIG_USB_EHCI_HCD=y
CONFIG_MXC_USB_OTG_HACTIVE=y
CONFIG_CMD_USB_MASS_STORAGE=y
CONFIG_USB_STORAGE=y
CONFIG_USB_GADGET=y
CONFIG_USB_GADGET_MANUFACTURER="SomLabs"
CONFIG_USB_GADGET_VENDOR_NUM=0x1b67
CONFIG_USB_GADGET_PRODUCT_NUM=0x4000
CONFIG_CI_UDC=y
CONFIG_USB_GADGET_DOWNLOAD=y
form dts
regulators {
         compatible = "simple-bus";
         #address-cells = <1>;
         #size-cells = <0>;
reg_usb_otg1_vbus: regulator@2 {
             compatible = "regulator-fixed";
             reg = <2>;
             pinctrl-names = "default";
             pinctrl-0 = <&pinctrl_usb_otg1>;
             regulator-name = "usb_otg1_vbus";
             regulator-min-microvolt = <5000000>;
             regulator-max-microvolt = <5000000>;
             gpio = <&gpio2 8 GPIO_ACTIVE_HIGH>;
             enable-active-high;
         };
reg_usb_otg2_vbus: regulator@3 {
             compatible = "regulator-fixed";
             reg = <3>;
             pinctrl-names = "default";
             pinctrl-0 = <&pinctrl_usb_otg2>;
             regulator-name = "usb_otg2_vbus";
             regulator-min-microvolt = <5000000>;
             regulator-max-microvolt = <5000000>;
             gpio = <&gpio2 12 GPIO_ACTIVE_HIGH>;
             enable-active-high;
         };
};
pinctrl_usb_otg1: usbotg1grp {
             fsl,pins = <
                 MX6UL_PAD_ENET2_TX_DATA1__GPIO2_IO12    0x10b0
             >;
         };
pinctrl_usb_otg2: usbotg2grp {
             fsl,pins = <
                 MX6UL_PAD_ENET2_RX_DATA0__GPIO2_IO08    0x10b0
             >;
         };
&usbotg1 {
     vbus-supply = <&reg_usb_otg1_vbus>;
     dr_mode = "host";
     status = "okay";
};
&usbotg2 {
     vbus-supply = <&reg_usb_otg2_vbus>;
     dr_mode = "host";
     status = "okay";
};
My board is SomLabs Visionsom option with NAND 512Mb.
Thanks in advanced
Best Regards
Michal

Michał Wołowik

Lukasz Majewski

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