Boot Linux on Engicam i.MX6¶
This tutorial describe possible ways of booting Image like Linux and detailed documents are 1 2
Build the images here, and setup SD card with Single and Dual partitions here
bootm¶
Ramdisk¶
Create Single partition and Insert the SD on host and Built the images from Image Build
$ cd /path/to/u-boot
$ dd if=SPL of=/dev/mmcblk0 bs=1k seek=1
$ dd if=u-boot-dtb.img of=/dev/mmcblk0 bs=1k seek=69
$ cd /path/to/linux-next
$ cp arch/arm/boot/uImage /media/jagan/rootfs
$ cp arch/arm/boot/dts/imx6q-icore.dtb /media/jagan/rootfs
$ cp uarm_ramdisk.image.gz /media/jagan/rootfs
$ sync
$ umount /dev/mmcblk0p1
JM3 Closed
Connect the Serial cable between the Starter Kit and the PC for the console (J28 is the Linux Serial console connector)
Insert the micro SD card in the board, power it up.
U-Boot SPL 2017.09-00371-gcf42f39-dirty (Oct 05 2017 - 14:28:57)
Trying to boot from MMC1
Expected Linux image is not found. Trying to start U-boot
U-Boot 2017.09-00371-gcf42f39-dirty (Oct 05 2017 - 14:28:57 +0530)
CPU: Freescale i.MX6Q rev1.2 at 792MHz
CPU: Industrial temperature grade (-40C to 105C) at 31C
Reset cause: POR
Model: Engicam i.CoreM6 Quad/Dual Starter Kit
DRAM: 512 MiB
MMC: FSL_SDHC: 0
*** Warning - bad CRC, using default environment
No panel detected: default to Amp-WD
Display: Amp-WD (800x480)
In: serial
Out: serial
Err: serial
switch to partitions #0, OK
mmc0 is current device
Net:
Error: ethernet@02188000 address not set.
No ethernet found.
Hit any key to stop autoboot: 0
icorem6qdl>
icorem6qdl> ext4load mmc 0:1 ${loadaddr} uImage
7085712 bytes read in 372 ms (18.2 MiB/s)
icorem6qdl> ext4load mmc 0:1 0x83000000 uarm_ramdisk.image.gz
691373 bytes read in 89 ms (7.4 MiB/s)
icorem6qdl> ext4load mmc 0:1 ${fdt_addr} imx6q-icore.dtb
37085 bytes read in 45 ms (804.7 KiB/s)
icorem6qdl> printenv mmcargs
mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot}
icorem6qdl> printenv mmcroot
mmcroot=/dev/mmcblk0p2 rootwait rw
icorem6qdl> setenv mmcroot '/dev/ram rw earlycon'
icorem6qdl> run mmcargs
icorem6qdl> printenv bootargs
bootargs=console=ttymxc3,115200 root=/dev/ram rw earlycon
icorem6qdl> bootm ${loadaddr} 0x83000000 ${fdt_addr}
## Booting kernel from Legacy Image at 12000000 ...
Image Name: Linux-4.14.0-rc2-next-20170929-0
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 7085648 Bytes = 6.8 MiB
Load Address: 10008000
Entry Point: 10008000
Verifying Checksum ... OK
## Loading init Ramdisk from Legacy Image at 13000000 ...
Image Name:
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 691309 Bytes = 675.1 KiB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
## Flattened Device Tree blob at 18000000
Booting using the fdt blob at 0x18000000
Loading Kernel Image ... OK
Loading Ramdisk to 2eed2000, end 2ef7ac6d ... CACHE: Misaligned operation at range [2eed2000, 2ef7ac6d]
OK
Using Device Tree in place at 18000000, end 1800c0dc
Starting kernel ...
Rootfs¶
Monolithic¶
FIT¶
vmlinux.bin¶
$ arm-linux-gnueabi-objcopy -O binary /to/path/linux-next-imx/vmlinux vmlinux.bin
$ gzip vmlinux.bin
FIT Input¶
FIT input for Linux and FDT, here and Linux, FDT and Ramdisk, here
/dts-v1/;
/ {
description = "FIT image with single Linux kernel and FDT blob";
#address-cells = <1>;
images {
kernel@1 {
description = "i.MX6Q Linux kernel";
data = /incbin/("./vmlinux.bin.gz");
type = "kernel";
arch = "arm";
os = "linux";
compression = "gzip";
load = <0x10008000>;
entry = <0x10008000>;
hash@1 {
algo = "md5";
};
hash@2 {
algo = "sha1";
};
};
fdt@1 {
description = "i.CoreM6 Quad/Dual Devicetree blob";
data = /incbin/("./imx6q-icore.dtb");
type = "flat_dt";
arch = "arm";
compression = "none";
hash@1 {
algo = "md5";
};
hash@2 {
algo = "sha1";
};
};
};
configurations {
default = "conf@1";
conf@1 {
description = "Boot Linux kernel and FDT blob";
kernel = "kernel@1";
fdt = "fdt@1";
};
};
};
FIT Output¶
$ /to/path/u-boot/tools/mkimage -f kernel_fdt.its fit.itb
$ cp fit.itb /media/jagan/BOOT
FIT Boot¶
Hit any key to stop autoboot: 0
Booting from mmc ...
reading boot.scr
** Unable to read file boot.scr **
reading fit.itb
6485068 bytes read in 335 ms (18.5 MiB/s)
Booting FIT image from mmc ...
## Loading kernel from FIT Image at 12000000 ...
Using 'conf@1' configuration
Verifying Hash Integrity ... OK
Trying 'kernel@1' kernel subimage
Description: i.MX6Q Linux kernel
Type: Kernel Image
Compression: gzip compressed
Data Start: 0x120000e4
Data Size: 6446108 Bytes = 6.1 MiB
Architecture: ARM
OS: Linux
Load Address: 0x10008000
Entry Point: 0x10008000
Hash algo: md5
Hash value: 1580c77b97e137d81d4ad804fba3065c
Hash algo: sha1
Hash value: e699babcc853bf0be519eedbba173e5795a8941b
Verifying Hash Integrity ... md5+ sha1+ OK
## Loading fdt from FIT Image at 12000000 ...
Using 'conf@1' configuration
Trying 'fdt@1' fdt subimage
Description: i.CoreM6 Quad/Dual Devicetree blob
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x12625e38
Data Size: 37081 Bytes = 36.2 KiB
Architecture: ARM
Hash algo: md5
Hash value: 7e01cb60cef8d98d018aaf0d4455b970
Hash algo: sha1
Hash value: 4ecef92ce375160d11ee7363aebc8058c1e02878
Verifying Hash Integrity ... md5+ sha1+ OK
Booting using the fdt blob at 0x12625e38
Uncompressing Kernel Image ... OK
Using Device Tree in place at 12625e38, end 12631f10
Starting kernel ...
Verified Boot¶
vmlinux.bin¶
$ arm-linux-gnueabi-objcopy -O binary vmlinux vmlinux.bin
$ gzip vmlinux.bin
$ cp imx6q-icore-rqs.dtb imx6q-icore-rqs-pubkey.dtb
FIT input¶
kernel_fdt.its
/* Simple U-Boot uImage source file containing a single kernel and FDT blob */
/dts-v1/;
/ {
description = "Verified RSA image with single Linux kernel and FDT blob";
#address-cells = <1>;
images {
kernel@1 {
description = "i.MX6 Linux kernel";
data = /incbin/("./vmlinux.bin.gz");
type = "kernel";
arch = "arm";
os = "linux";
compression = "gzip";
load = <0x10008000>;
entry = <0x10008000>;
hash@1 {
algo = "md5";
};
hash@2 {
algo = "sha1";
};
signature@1 {
algo = "sha1,rsa2048";
key-name-hint = "eng";
};
};
fdt@1 {
description = "Engicam i.CoreM6 Quad/Dual RQS Starter Kit Devicetree blob";
data = /incbin/("./imx6q-icore-rqs.dtb");
type = "flat_dt";
arch = "arm";
compression = "none";
hash@1 {
algo = "md5";
};
hash@2 {
algo = "sha1";
};
signature@1 {
algo = "sha1,rsa2048";
key-name-hint = "eng";
};
};
};
configurations {
default = "conf@1";
conf@1 {
description = "Boot Linux kernel with FDT blob";
kernel = "kernel@1";
fdt = "fdt@1";
};
};
};
RSA key¶
- Create RSA key pair
$ mkdir mykeys
$ openssl genrsa -F4 -out mykeys/eng.key 2048
- Create a certificate contains public key
$ openssl req -batch -new -x509 -key mykeys/eng.key -out mykeys/eng.crt
FIT output¶
$ ./mkimage -f kernel_fdt.its -K imx6q-icore-rqs-pubkey.dtb -k mykeys/ -r fit.itb
Build U-Boot Public key¶
$ .make DEV_TREE_BIN=../imx6q-icore-rqs-pubkey.dtb
VerifiedBoot¶
U-Boot SPL 2017.01-rc2-00010-gb42d823 (Dec 21 2016 - 11:13:46)
Trying to boot from MMC1
U-Boot 2017.01-rc2-00010-gb42d823 (Dec 21 2016 - 11:13:46 +0100)
CPU: Freescale i.MX6D rev1.2 at 792 MHz
Reset cause: POR
Model: Engicam i.CoreM6 Quad/Dual RQS Starter Kit
DRAM: 512 MiB
MMC: FSL_SDHC: 0
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: No ethernet found.
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
reading boot.scr
** Unable to read file boot.scr **
reading fit.itb
6167494 bytes read in 335 ms (17.6 MiB/s)
Booting FIT image from mmc ...
## Loading kernel from FIT Image at 12000000 ...
Using 'conf@1' configuration
Verifying Hash Integrity ... OK
Trying 'kernel@1' kernel subimage
Description: i.MX6 Linux kernel
Type: Kernel Image
Compression: gzip compressed
Data Start: 0x120000f0
Data Size: 6130148 Bytes = 5.8 MiB
Architecture: ARM
OS: Linux
Load Address: 0x10008000
Entry Point: 0x10008000
Hash algo: md5
Hash value: b975a202ea2963c53c53f527329930cd
Hash algo: sha1
Hash value: 78b93fe404b795de8c837af27d67f4df9b96083a
Sign algo: sha1,rsa2048:eng
Sign value: 4288ce2c7380a90b7b7b9c000760f086fe67560d16fb5ea85bc792ff3ed70e381956bbff99c514213e00e3d21838650ada0eb68439e253ef493e3e0098e0d47109d3e
Verifying Hash Integrity ... md5+ sha1+ sha1,rsa2048:eng- OK
## Loading fdt from FIT Image at 12000000 ...
Using 'conf@1' configuration
Trying 'fdt@1' fdt subimage
Description: Engicam i.CoreM6 Quad/Dual RQS Starter Kit Devicetree blob
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x125d8dbc
Data Size: 35298 Bytes = 34.5 KiB
Architecture: ARM
Hash algo: md5
Hash value: 4371a4dfe55127c2fda8a9feb4d3b313
Hash algo: sha1
Hash value: e34a9326b5e7fd43557753ef980fe67326f82ea1
Sign algo: sha1,rsa2048:eng
Sign value: 94cebd60a6ff2e123ed763760b88c026b74b12eb9c37a97d73eec1a25e01d6e29284f393c5ca20951a605378bf8b547bdc0ce0aae16e069e6db0c5af7f00d4cfc6c94
Verifying Hash Integrity ... md5+ sha1+ sha1,rsa2048:eng- OK
Booting using the fdt blob at 0x125d8dbc
Uncompressing Kernel Image ... OK
Using Device Tree in place at 125d8dbc, end 125e479d
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.9.0-next-20161216-dirty (root@jagan-XPS-13-9350) (gcc version 4.7.1 20120402 (prerelease) (crosstool-NG linaro-1.13.1-206
[ 0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt:Machine model: Engicam i.CoreM6 Quad SOM
[ 0.000000] cma: Reserved 64 MiB at 0x2c000000
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] percpu: Embedded 14 pages/cpu @dbb9d000 s26816 r8192 d22336 u57344
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 130048
[ 0.000000] Kernel command line: console=ttymxc3,115200 root=/dev/mmcblk0p2 rootwait rw
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 3.750068] #0: imx-audio-sgtl5000
[ 3.765128] EXT4-fs (mmcblk0p2): couldn't mount as ext3 due to feature incompatibilities
[ 3.807473] usb 1-1: device descriptor read/64, error -71
[ 4.020338] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 4.028685] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 4.038301] devtmpfs: mounted
[ 4.044169] Freeing unused kernel memory: 1024K
INIT: [ 4.177458] usb 1-1: device descriptor read/64, error -71
version 2.88 booting
[ 4.437640] usb 1-1: new full-speed USB device number 3 using ci_hdrc
mount: mount point /mnt/.psplash does not exist
[ 4.677537] usb 1-1: device descriptor read/64, error -71
Starting udev