topic Re: Linux booting on MCIMX28EVK in i.MX Processors

Linux booting on MCIMX28EVK

pt — Thu, 10 Jul 2014 06:35:43 GMT

Hi Qiang_FSL, raymondwang, JackLee1z igorpadykov YixingKong

I am using MCIMX28EVK board. I have used the script mk_mx28_sd to load uboot (imx28_ivt_uboot.sb) and rootfs on the SD card.

./mk_mx28_sd -u /dev/sdb

I need to configure u-boot to boot the kernel from the SD card. I used u-boot commands to boot(boot,bootm).

But linux image is not loading.

/* terminal message*/

PowerPrep start initialize power...

Battery Voltage = 4.24V

boot from battery. 5v input not detected

May 20 201412:16:00

FRAC 0x92925552

memory type is DDR2

Wait for ddr ready 1power 0x00820710

Frac 0x92925552

start change cpu freq

hbus 0x00000003

cpu 0x00010001

U-Boot 2009.08 (Jun 03 2014 - 16:56:55)

Freescale i.MX28 family

CPU: 454 MHz

BUS: 151 MHz

EMI: 205 MHz

GPMI: 24 MHz

DRAM: 128 MB

MMC: IMX_SSP_MMC: 0, IMX_SSP_MMC: 1

In: serial

Out: serial

Err: serial

Net: got MAC address from IIM: 00:04:9f:02:b6:94

FEC0

Hit any key to stop autoboot: 0

MX28 U-Boot > boot

Unknown command 'console=ttyAM0,115200' - try 'help'

MX28 U-Boot > bootm

Wrong Image Format for bootm command

ERROR: can't get kernel image!

MX28 U-Boot >

The printenv commands displays the following messages

MX28 U-Boot > printenv

ipaddr=192.168.1.103

serverip=192.168.1.101

netmask=255.255.255.0

bootcmd_net=run bootargs_nfs; dhcp; bootm

bootcmd_mmc=run bootargs_mmc; mmc read 0 ${loadaddr} 100 3000; bootm

ethact=FEC0

bootdelay=5

bootargs_mmc=console=ttyAM0,115200 root=/dev/mmcblk0p3 rw rootwait ip=none ssp1

bootcmd=run bootargs_mmc

bootargs_nfs=/boot/uImage

nfsroot=/tools/rootfs

bootfile=uImage

baudrate=115200

kernel=uImage

loadaddr=40000000

bootargs=noinitrd console=ttymxc0,115200 init=/linuxrc root=/dev/nfs nfsroot=10.29.244.27:/tftpboot/rootfs ip=dhcp

bootargs_base=setenv bootargs console=ttyAM0,115200

stdin=serial

stdout=serial

stderr=serial

ver=U-Boot 2009.08 (Jun 03 2014 - 16:56:55)

Environment size: 670/130044 bytes

How can I configure u-boot to be able to boot the linux image from sd?

Regards

Pt A R

Re: Linux booting on MCIMX28EVK

Yuri — Thu, 10 Jul 2014 07:01:01 GMT

You wrote that U-boot and rootfs were located on SD. So, the kernel - does not.
It is needed to locate the kernel and rootfs ; U-boot is needed for NFS using.

Have a great day,
Yuri

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Re: Linux booting on MCIMX28EVK

PeterChan — Thu, 10 Jul 2014 07:07:12 GMT

Unknown command 'console=ttyAM0,115200' - try 'help'

- It is because the "setenv" is missing. You should use "bootargs_mmc=setenv bootargs console=ttyAM0,115200 root=/dev/mmcblk0p3 rw rootwait ip=none ssp1"

Wrong Image Format for bootm command

ERROR: can't get kernel image!

- In your boot argument "bootcmd_mmc=run bootargs_mmc; mmc read 0 ${loadaddr} 100 3000; bootm", you are attempting to load the uImage from MMC offset (100 x 512) or 0xC800. Are you sure your uImage is programmed to 0xC800 and not (0x100 x 512) = 0x20000? For the latter case, please change the load address from "100" to "0x100" and size from "3000" to "0x3000". Please also be reminded that MMC address offset (0x400 ~ 0x20000) is the reserved space for storing boot environment. You should never overwrite this area.

Re: Linux booting on MCIMX28EVK

pt — Thu, 10 Jul 2014 07:34:31 GMT

Hi PeterChan

I used ltib to build uboot and linux image and used the mk_mx28_sd script to load rootfs and uboot to sd.

I have tried this command

setenv bootcmd_mmc run bootargs_mmc; mmc read 0 ${loadaddr} 0x100 0x3000; bootm

But it throws the following error.

MMC read: dev # 0, block # 256,count 12288 ...

12288 blocks read: OK

Wrong Image Format for bootm command

ERROR: can't get kernel image!

Is there any other method to program u-boot and rootfs to sd card?

Can you share the steps to configure the u-boot to boot linux from sd card?

Regards

Re: Re: Linux booting on MCIMX28EVK

PeterChan — Thu, 10 Jul 2014 08:12:57 GMT

I am sorry I made a mistake in the boot argument in my previous reply and I have amended it. To make it clear, here is the boot argument I am using to load i.MX28 uImage from SD.

bootdelay=3

baudrate=115200

ipaddr=192.168.1.103

serverip=192.168.1.101

netmask=255.255.255.0

bootfile="uImage"

loadaddr=0x42000000

nfsroot=/home/notroot/nfs/rootfs

bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp fec_mac=${ethaddr}

bootcmd_net=run bootargs_nfs; dhcp; bootm

ethact=FEC0

bootargs=console=ttyAM0,115200n8

bootargs_mmc=setenv bootargs ${bootargs} root=/dev/mmcblk0p3 rw rootwait ip=none fec_mac=${ethaddr}

bootcmd_mmc=run bootargs_mmc; mmc read 0 ${loadaddr} 0x100 0x2000; bootm

bootcmd=run bootcmd_mmc

stdin=serial

stdout=serial

stderr=serial

3 partitions are created on the SD card. The beginning few MB of the SD card is reserved for boot argument & uImage. The u-boot is stored to partition 1 and the rootfs is stored to partition 3.

Disk /dev/sdc: 1977 MB, 1977614336 bytes

61 heads, 62 sectors/track, 1021 cylinders

Units = cylinders of 3782 * 512 = 1936384 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xb3157905

Device Boot Start End Blocks Id System

/dev/sdc1 16 32 32147 53 OnTrack DM6 Aux3

/dev/sdc2 33 128 181536 b W95 FAT32

/dev/sdc3 129 1021 1688663 83 Linux

DD command is used to program the uImage to SD at sector offset 0x100.

dd if=./rootfs/boot/uImage of=/dev/sdX bs=512 seek=256 && sync && sync

Re: Linux booting on MCIMX28EVK

pt — Thu, 10 Jul 2014 11:39:25 GMT

Thanks PeterChan.

I have followed the steps provided in the following thread.

https://community.freescale.com/message/273177#273177

Linux booted successfully

Regards