i.MX ProcessorsのトピックBoard won't boot from SD card

Board won't boot from SD card

totalit — Wed, 15 Sep 2021 13:59:40 GMT

I'm using MYS-6ULY2-256N2. I built a mys6ull14x14 image, loaded it into the board. Boot won't go further the line "Normal boot", waiting for input. Here's a log:

U-Boot 2016.03-mys-6ulx+ga175019 (Aug 31 2021 - 00:42:41 -0700)

CPU: Freescale i.MX6ULL rev1.1 528 MHz (running at 396 MHz)
CPU: Industrial temperature grade (-40C to 115C) at 41C
Reset cause: POR
Board: MYS-MX6ULL 14x14
I2C: ready
DRAM: 256 MiB
NAND: 256 MiB
MMC: FSL_SDHC: 0
Display: TFT43AB (480x272)
Video: 480x272x24
In: serial
Out: serial
Err: serial
Net: FEC0
Normal Boot

And environment variables:

baudrate=115200
board_name=MYS6ULL
board_rev=14X14
bootargs=console=ttymxc0,115200 ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:5m(boot),1m(env),8m(kernel),2m(dtb),160m(rootfs1),-(userdata)
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=3
console=ttymxc0
envflag=1
ethact=FEC0
ethaddr=f4:4d:30:53:40:11
ethprime=FEC
fdt_addr=0x83000000
fdt_high=0xffffffff
initrd_addr=0x83800000
initrd_high=0xffffffff
loadaddr=0x80800000
mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.file=/fat g_mass_storage.ro=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage.iSerialNumber="" mtdparts=5m(boot),1m(env),8m(kernel),2m(dtb),160m(rootfs1),-(userdata) clk_ignore_unused
mtdids=nand0=gpmi-nand
nand_erasesize=20000
nand_oobsize=40
nand_writesize=800
panel=TFT43AB
partition=nand0,0

Environment size: 993/1048572 bytes

Re: Board won't boot from SD card

igorpadykov — Wed, 15 Sep 2021 23:16:06 GMT

one can try to decrease cma size, "linux,cma" in dts

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm/boot/dts/imx6ull-14x14-evk.dts?h=imx_4.1.15_2.0.0_ga

also recommended to debug it using AN4553 Using Open Source Debugging Tools

for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

Best regards
igor

Re: Board won't boot from SD card

totalit — Thu, 16 Sep 2021 14:26:02 GMT

I set cma size to <0x10000000>, but it hasn't affected booting.

I contacted the vendor tech support, they run my image without a problem. I attached their log.

Could I burn the image in a wrong way? I tried Win32DiskImager on Windows and dd command on Ubuntu (to be precise, sudo dd if=core-image-base-mys6ull14x14.rootfs.sdcard of=/dev/sdb1 bs=4M), but result is always the same.

Re: Board won't boot from SD card

totalit — Wed, 22 Sep 2021 14:07:31 GMT

So, no clue? Can I enable Earlycon in linux kernel to debug it? Is there a guide for earlycon (haven't found it via google)?

Re: Board won't boot from SD card

igorpadykov — Thu, 23 Sep 2021 00:36:16 GMT

suggest to apply for support to vendor of MYS-6ULY2-256N2 board:
http://www.myirtech.com/support.asp

Best regards
igor

Re: Board won't boot from SD card

totalit — Thu, 23 Sep 2021 07:43:29 GMT

I've already contacted the vendor tech support, they run my image without a problem.

Re: Board won't boot from SD card

totalit — Thu, 23 Sep 2021 09:21:18 GMT

I manually wrote those commands from boot.scr in the terminal and kernel has been loaded:

setenv mmcroot '/dev/mmcblk0p2 rootwait rw rootdelay=5 mem=256M'
setenv mmcargs 'setenv bootargs console=${console},${baudrate} \ root=${mmcroot} mtdparts=gpmi-nand:5m(boot),10m(kernel),\ 1m(dtb),-(rootfs)'
run mmcargs
fatload mmc 0 0x83000000 zImage
fatload mmc 0 0x84000000 mys-imx6ull-14x14-evk-emmc.dtb
bootz 0x83000000 - 0x84000000

But why does it work that way? According to the guide, boot.scr is necessary for eMMC, not NAND.