Facing issue in loading UART for Beaglebone debian

Embedded Linux Discussions
1

Following are my configurations:

I have a beaglebone with Debian OS. I have an sd card with 4 Partitions.

Partition 1 ( mmcblk0p1 ) contains following bootloader configurations:-

1. /boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless.dtb
2. /boot/vmlinuz-4.14.71-ti-r80
3. /boot/uEnv.txt
4. /boot/initrd.img-4.14.71-ti-r80
5. /lib/firmware/BB-UART4-00A0.dtbo
6. /lib/firmware/BB-UART1-00A0.dtbo
7. /lib/firmware/BB-I2C2-00A0.dtbo
8. /lib/firmware/AM335X-PRU-UIO-00A0.dtbo
9. /lib/firmware/BB-BBGW-WL1835-00A0.dtbo
10. /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo
11. /lib/firmware/BB-ADC-00A0.dtbo
12. /uEnv.txt

Partition 2 ( mmcblk0p2 ) contains the Debian OS.

Partition 3 ( mmcblk0p3 ) contains another Debian OS.

Partition 4 ( mmcblk0p4 ) decides from Which partition to boot?

/uEnv.txt from mmcblk0p1 reads from mmcblk0p4 and decides from which partition to boot.

In /boot/uEnv.txt I have enabled following Configs:

    uname_r=4.14.71-ti-r80
    enable_uboot_overlays=1
    uboot_overlay_addr0=/lib/firmware/BB-UART4-00A0.dtbo
    uboot_overlay_addr1=/lib/firmware/BB-UART1-00A0.dtbo
    uboot_overlay_addr2=/lib/firmware/BB-I2C2-00A0.dtbo
    uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo
    enable_uboot_cape_universal=1
    cmdline=coherent_pool=1M net.ifnames=0 quiet

This is my /uEnv.txt:

    rdaddr=0x88080000

    initrd_high=0xffffffff
    fdt_high=0xffffffff

    loadxrd=echo debug: [/boot/initrd.img-${uname_r}] ... ; load mmc 0:1 ${rdaddr} /boot/initrd.img-${uname_r}; setenv rdsize ${filesize}
    loaduEnvtxt=load mmc 0:1 ${loadaddr} /boot/uEnv.txt ; env import -t ${loadaddr} ${filesize};
    check_dtb=if test -n ${dtb}; then setenv fdtfile ${dtb};fi;
    check_uboot_overlays=if test -n ${enable_uboot_overlays}; then setenv enable_uboot_overlays ;fi;

    loadall=run loaduEnvtxt; run check_dtb; run check_uboot_overlays; run loadxrd;

    rootpart=0:2
    flagpart=0:4
    bootdir=/boot
    bootfile=vmlinuz-4.14.71-ti-r80
    console=ttyO0,115200n8
    fdtaddr=0x88000000
    fdtfile=am335x-bonegreen-wireless.dtb
    loadaddr=0x82000000
    mmcroot=/dev/mmcblk0p2 ro
    mmcrootfstype=ext4 rootwait

    mmcargs=setenv bootargs console=${console} ${optargs} ${cape_disable} ${cape_enable} root=${mmcroot} rootfstype=${mmcrootfstype} ${cmdline}

    loadfdt=echo debug: [/boot/dtbs/${uname_r}/${fdtfile}] ... ;load mmc 0:1 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile}

    loadimage=echo debug: [/boot/vmlinuz-${uname_r}] ... ; load mmc 0:1 ${loadaddr} /boot/vmlinuz-${uname_r}

    boot_three=setenv rootpart 0:3; setenv mmcroot /dev/mmcblk0p3 ro

    findroot=\
    	if test -e mmc $flagpart three; then \
    		if test -e mmc $flagpart three_ok; then \
    			run boot_three; \
    		elif test ! -e mmc $flagpart three_tried; then \
    			fatwrite mmc $flagpart $loadaddr three_tried 4; \
    			run boot_three; \
    		fi; \
    	elif test -e mmc $flagpart two; then \
    		if test ! -e mmc $flagpart two_ok; then \
    			if test -e mmc $flagpart two_tried; then \
    				run boot_three; \
    			else \
    				fatwrite mmc $flagpart $loadaddr two_tried 4; \
    			fi; \
    		fi; \
    	fi;
    uenvcmd=\
    	run loadall; \
    	run findroot; \
    	echo Using root partition ${rootpart}; \
    	if run loadfdt; then \
    		echo Inside loadfdt; \
    		setenv fdt_buffer 0x60000; \
    		fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART4-00A0.dtbo; \
    		echo I have loaded BB-UART4-00A0.dtbo; \
    		fdt addr ${fdtaddr}; \
    		fdt resize ${fdt_buffer}; \
    		fdt apply ${rdaddr}; \
    		fdt resize ${fdt_buffer}; \
    		fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \
    		echo I have loaded BB-UART1-00A0.dtbo; \
    		if run loadimage; then \
    			run mmcargs; \
    			bootz ${loadaddr} - ${fdtaddr}; \
    		fi; \
    	fi;

Boot logs:

    U-Boot SPL 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500)
    Trying to boot from MMC2
    Loading Environment from EXT4...
    ** Unable to use mmc 0:1 for loading the env **
    U-Boot 2018.09-00002-g0b54a51eee (Sep 10 2018 - 19:41:39 -0500), Build: jenkins-github_Bootloader-Builder-65
    CPU  : AM335X-GP rev 2.1
    I2C:   ready
    DRAM:  512 MiB
    No match for driver 'omap_hsmmc'
    No match for driver 'omap_hsmmc'
    Some drivers were not found
    Reset Source: Power-on reset has occurred.
    RTC 32KCLK Source: External.
    MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
    Loading Environment from EXT4...
    ** Unable to use mmc 0:1 for loading the env **
    Board: BeagleBone Black
    <ethaddr> not set. Validating first E-fuse MAC
    BeagleBone Black:
    Model: SeeedStudio BeagleBone Green Wireless:
    BeagleBone: cape eeprom: i2c_probe: 0x54:
    BeagleBone: cape eeprom: i2c_probe: 0x55:
    BeagleBone: cape eeprom: i2c_probe: 0x56:
    BeagleBone: cape eeprom: i2c_probe: 0x57:
    Net:   eth0: MII MODE
    Could not get PHY for cpsw: addr 0
    cpsw, usb_ether
    Press SPACE to abort autoboot in 2 seconds
    board_name=[A335BNLT] ...
    board_rev=[GW1A] ...
    switch to partitions #0, OK
    mmc0 is current device
    SD/MMC found on device 0
    switch to partitions #0, OK
    mmc0 is current device
    Scanning mmc 0:1...
    60067 bytes read in 5 ms (11.5 MiB/s)
    gpio: pin 56 (gpio 56) value is 0
    gpio: pin 55 (gpio 55) value is 0
    gpio: pin 54 (gpio 54) value is 0
    gpio: pin 53 (gpio 53) value is 1
    switch to partitions #0, OK
    mmc0 is current device
    gpio: pin 54 (gpio 54) value is 1
    Checking for: /uEnv.txt ...
    2257 bytes read in 2 ms (1.1 MiB/s)
    gpio: pin 55 (gpio 55) value is 1
    Loaded environment from /uEnv.txt
    Importing environment from mmc ...
    Checking if uenvcmd is set ...
    test - minimal test like /bin/sh
    Usage:
    test [args..]
    Checking if client_ip is set ...
    Checking for: /boot.scr ...
    Checking for: /boot/boot.scr ...
    Checking for: /boot/uEnv.txt ...
    gpio: pin 55 (gpio 55) value is 1
    2176 bytes read in 3 ms (708 KiB/s)
    Loaded environment from /boot/uEnv.txt
    Checking if uname_r is set in /boot/uEnv.txt...
    gpio: pin 56 (gpio 56) value is 1
    Running uname_boot ...
    loading /boot/vmlinuz-4.14.71-ti-r80 ...
    debug: [/boot/vmlinuz-4.14.71-ti-r80] ...
    10416640 bytes read in 652 ms (15.2 MiB/s)
    debug: [enable_uboot_overlays=1] ...
    debug: [enable_uboot_cape_universal=1] ...
    debug: [uboot_base_dtb_univ=am335x-bonegreen-wireless-uboot-univ.dtb] ...
    uboot_overlays: [uboot_base_dtb=am335x-bonegreen-wireless-uboot-univ.dtb] ...
    uboot_overlays: Switching too: dtb=am335x-bonegreen-wireless-uboot-univ.dtb ...
    debug: [/boot/dtbs/4.14.71-ti-r80/am335x-bonegreen-wireless-uboot-univ.dtb] ...
    156290 bytes read in 14 ms (10.6 MiB/s)
    uboot_overlays: [fdt_buffer=0x60000] ...
    uboot_overlays: loading /lib/firmware/BB-UART4-00A0.dtbo ...
    1075 bytes read in 3 ms (349.6 KiB/s)
    uboot_overlays: loading /lib/firmware/BB-UART1-00A0.dtbo ...
    1075 bytes read in 3 ms (349.6 KiB/s)
    uboot_overlays: loading /lib/firmware/BB-I2C2-00A0.dtbo ...
    1152 bytes read in 3 ms (375 KiB/s)
    uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
    1440 bytes read in 3 ms (468.8 KiB/s)
    uboot_overlays: loading /lib/firmware/BB-BBGW-WL1835-00A0.dtbo ...
    4839 bytes read in 3 ms (1.5 MiB/s)
    uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
    711 bytes read in 3 ms (231.4 KiB/s)
    uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo ...
    2402 bytes read in 3 ms (781.3 KiB/s)
    loading /boot/initrd.img-4.14.71-ti-r80 ...
    4799493 bytes read in 303 ms (15.1 MiB/s)
    debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] ...
    debug: [bootz 0x82000000 0x88080000:493c05 88000000] ...
    ## Flattened Device Tree blob at 88000000
       Booting using the fdt blob at 0x88000000
       reserving fdt memory region: addr=88000000 size=88000
       Using Device Tree in place at 88000000, end 8808afff
    Starting kernel ...
    [    0.002080] timer_probe: no matching timers found
    [    1.135823] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
    [    1.486352] omap_voltage_late_init: Voltage driver support not added
    [    1.493340] PM: Cannot get wkup_m3_ipc handle
    mount: mounting /dev/mmcblk0p1 on /root failed: Invalid argument
    mount: mounting /dev on /root/dev failed: No such file or directory
    mount: mounting /dev on /root/dev failed: No such file or directory
    mount: mounting /run on /root/run failed: No such file or directory
    run-init: current directory on the same filesystem as the root: error 0
    Target filesystem doesn't have requested /sbin/init.
    run-init: current directory on the same filesystem as the root: error 0
    run-init: current directory on the same filesystem as the root: error 0
    run-init: current directory on the same filesystem as the root: error 0
    run-init: current directory on the same filesystem as the root: error 0
    run-init: current directory on the same filesystem as the root: error 0
    No init found. Try passing init= bootarg.
    BusyBox v1.22.1 (Debian 1:1.22.0-19+b3) built-in shell (ash)
    Enter 'help' for a list of built-in commands.
    (initramfs)

I am unable to understand What’s going wrong here?

Thanks

2

@sharvin26, first please don’t jump mailing list’s. It’s impolite to anyone stuck with a similar problem…

Original Thread: https://groups.google.com/d/msg/beagleboard/1bgHA-JWdDQ/xH-ukjsFAwAJ

As one of the users of both mailing list, I will be asking you to post your solution back to the original thread.

Second, as stated, the “uenvcmd” is not supported in general, as you can pretty do anything you want. Thus it’s up to “YOU” to implement what you want.

From your “current” issue:

test - minimal test like /bin/sh
Usage:
test [args..]

Looking at your previous file with your current build, there is no “new” test function call? It looks like you didn’t copy the two files correctly somewhere…

Moving on to your last issue on the other thread:

https://groups.google.com/d/msg/beagleboard/1bgHA-JWdDQ/3mUu6kcvBAAJ

You had used

setenv fdt_buffer 0x60000; \ 
fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART4-00A0.dtbo; \         
fdt addr ${fdtaddr}; \
fdt resize ${fdt_buffer}; \ 
fdt apply ${rdaddr}; \ 
fdt resize ${fdt_buffer}; \ 
fatload mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \

When i had recommended:

    if run loadfdt; then \ 
        echo Loaded ${fdtfile}; \ 
        setenv fdt_buffer 0x60000; \ 
        load mmc 0:1 ${rdaddr} /lib/firmware/BB-UART4-00A0.dtbo; \ 
        fdt addr ${fdtaddr}; \ 
        fdt resize ${fdt_buffer}; \ 
        fdt apply ${rdaddr}; \ 
        fdt resize ${fdt_buffer}; \ 
        load mmc 0:1 ${rdaddr} /lib/firmware/BB-UART1-00A0.dtbo; \ 
        fdt addr ${fdtaddr}; \ 
        fdt resize ${fdt_buffer}; \ 
        fdt apply ${rdaddr}; \ 
        fdt resize ${fdt_buffer}; \ 
        <and so on> 
        <and so on> 
        if run loadimage; then \ 
            run mmcargs; \ 
            bootz ${loadaddr} - ${fdtaddr}; \ 
        fi; \ 
    fi;

That should work, as it’s the way we’ve been shipping u-boot for a few years…

Anywho, let’s just move on to option B… Just use the command line “fdtoverlay”

3) fdtoverlay -- Flat Device Tree overlay applicator

The fdtoverlay applies an arbitrary number of FDT overlays to a base FDT blob
to a given output file.

The syntax of the fdtoverlay command line is:

    fdtoverlay -i <base-blob> -o <output-blob> <overlay-blob0> [<overlay-blob1> ...]

Where options are:
    -i, --input         Input base DT blob
    -o, --output        Output DT blob
    -v, --verbose       Verbose message output

and thus bypassing doing overlays in your “uenvcmd” script…

Regards,

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