How to boot from the backup kernel

[logerhong]

imx6dl kernel if broken, how to set up from the backup kernel, uboot how to configure, in trouble!

[logerhong]

My partitionedis as follows,；

8000000.nor: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x000001 Chip ID 0x002801
Amd/Fujitsu Extended Query Table at 0x0040
Amd/Fujitsu Extended Query version 1.5.
number of CFI chips: 1
12 cmdlinepart partitions found on MTD device 8000000.nor
Creating 12 MTD partitions on "8000000.nor":
0x000000000000-0x000000180000 : "uboot"
0x000000180000-0x000000200000 : "env"
0x000000200000-0x000000d80000 : "kernel"
0x000000d80000-0x000000e00000 : "dtb"
0x000000e00000-0x000003600000 : "rootfs"
0x000003600000-0x000004180000 : "kernel_bk"
0x000004180000-0x000004200000 : "dtb_bk"
0x000004200000-0x000006a00000 : "rootfs_bk"
0x000006a00000-0x000006b00000 : "productinfo"
0x000006b00000-0x000006c00000 : "config"
0x000006c00000-0x000007c00000 : "log"
0x000007c00000-0x000008000000 : "reserved"

I now want to start kuble in uboot failed to start from kernel_bk, how should i judge kernle start failure, then in uboot, then jump to backup kernel_bk start it,
I now configure the boot as follows:

norargs=setenv bootargs console=${console},${baudrate} ${smp} ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=8000000.nor:1536k(uboot),512k(env),11776k(kernel),512k(dtb),40m(rootfs),11776k(kernel_bk),512k(dtb_bk),40m(rootfs_bk),1024k(productinfo),1024k(config),16m(log),-(reserved)
norboot=echo Booting from nor flash ...; run norargs; run norbootcmd;
norbootcmd=cp.b 0x08200000 ${loadaddr} 0x700000; cp.b 0x8d80000 ${fdt_addr} 0x20000;bootz ${loadaddr} - ${fdt_addr}

Thank you for your reply!

[igorpadykov]

Hi 秋宏 罗

in general one can have two kernel images on different devices, for example

one on sd and other on emmc. Please look at Linux Guide included in doc package below

for programming steps

https://www.nxp.com/webapp/Download?colCode=L4.9.11_1.0.0_LINUX_DOCS&Parent_nodeId=13376994810717061... 

Best regards
igor
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[logerhong]

My partitionedis as follows,；

8000000.nor: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x000001 Chip ID 0x002801
Amd/Fujitsu Extended Query Table at 0x0040
Amd/Fujitsu Extended Query version 1.5.
number of CFI chips: 1
12 cmdlinepart partitions found on MTD device 8000000.nor
Creating 12 MTD partitions on "8000000.nor":
0x000000000000-0x000000180000 : "uboot"
0x000000180000-0x000000200000 : "env"
0x000000200000-0x000000d80000 : "kernel"
0x000000d80000-0x000000e00000 : "dtb"
0x000000e00000-0x000003600000 : "rootfs"
0x000003600000-0x000004180000 : "kernel_bk"
0x000004180000-0x000004200000 : "dtb_bk"
0x000004200000-0x000006a00000 : "rootfs_bk"
0x000006a00000-0x000006b00000 : "productinfo"
0x000006b00000-0x000006c00000 : "config"
0x000006c00000-0x000007c00000 : "log"
0x000007c00000-0x000008000000 : "reserved"

I now want to start kuble in uboot failed to start from kernel_bk, how should i judge kernle start failure, then in uboot, then jump to backup kernel_bk start it,
I now configure the boot as follows:

norargs=setenv bootargs console=${console},${baudrate} ${smp} ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=8000000.nor:1536k(uboot),512k(env),11776k(kernel),512k(dtb),40m(rootfs),11776k(kernel_bk),512k(dtb_bk),40m(rootfs_bk),1024k(productinfo),1024k(config),16m(log),-(reserved)
norboot=echo Booting from nor flash ...; run norargs; run norbootcmd;
norbootcmd=cp.b 0x08200000 ${loadaddr} 0x700000; cp.b 0x8d80000 ${fdt_addr} 0x20000;bootz ${loadaddr} - ${fdt_addr}

Thank you for your reply!