20161216_jeffrey - silenceuncrio/diary GitHub Wiki

	- CONFIG_ENV_OFFSET:

	   Offset of environment data (variable area) to the
	   beginning of flash memory; for instance, with bottom boot
	   type flash chips the second sector can be used: the offset
	   for this sector is given here.

	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.

	- CONFIG_ENV_SECT_SIZE:

	   Size of the sector containing the environment.


	b) Sometimes flash chips have few, equal sized, BIG sectors.
	   In such a case you don't want to spend a whole sector for
	   the environment.

	- CONFIG_ENV_SIZE:

	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
	   of this flash sector for the environment. This saves
	   memory for the RAM copy of the environment.

	   It may also save flash memory if you decide to use this
	   when your environment is "embedded" within U-Boot code,
	   since then the remainder of the flash sector could be used
	   for U-Boot code. It should be pointed out that this is
	   STRONGLY DISCOURAGED from a robustness point of view:
	   updating the environment in flash makes it always
	   necessary to erase the WHOLE sector. If something goes
	   wrong before the contents has been restored from a copy in
	   RAM, your target system will be dead.

...
5 cmdlinepart partitions found on MTD device gpmi-nand
Creating 5 MTD partitions on "gpmi-nand":
0x000000000000-0x000004000000 : "boot"
0x000004000000-0x000005000000 : "kernel"
0x000005000000-0x000006000000 : "dtb"
0x000006000000-0x00000a000000 : "rootfs"
0x00000a000000-0x000010000000 : "test"
...

...
mtd: opened '/dev/mtd0' - '(null)'
v4_rom_mtd_init()
fill_fcb()
mtd: bootstream too large
mtd_init failed!
UTP: sending Non-success to kernel for command $ kobs-ng init -x -v --chip_0_device_path=/dev/mtd0 $FILE.
utp_poll: exit with status 1280

...
11 cmdlinepart partitions found on MTD device gpmi-nand
Creating 11 MTD partitions on "gpmi-nand":
0x000000000000-0x000000300000 : "boot"
0x000000300000-0x000000400000 : "boot_env"
0x000000400000-0x000000e00000 : "kernel_a"
0x000000e00000-0x000001000000 : "dtb_a"
0x000001000000-0x000007000000 : "rootfs_a"
0x000007000000-0x000008000000 : "config_a"
0x000008000000-0x000008400000 : "misc"
0x000008400000-0x000008e00000 : "kernel_b"
0x000008e00000-0x000009000000 : "dtb_b"
0x000009000000-0x00000f000000 : "rootfs_b"
0x00000f000000-0x000010000000 : "config_b"
...
UBI: attached mtd4 (name "rootfs_a", size 96 MiB) to ubi0
...

root@M300:~# cat /etc/fw_env.config
# MTD device name    Device offset     Env. size         Flash sector size
/dev/mtd1            0x00000000        0x00100000        0x00100000
root@M300:~#

root@M300:/tmp# images/fw_printenv
Warning: Bad CRC, using default environment
bootargs=root=/dev/mtdblock0 console=ttyAM0 console=tty
bootcmd=
bootdelay=2
baudrate=38400

U-Boot 2015.04-imx_v2015.04_3.14.52_1.1.0_ga+g6cf684a (Dec 16 2016 - 05:20:17)

CPU:   Freescale i.MX6UL rev1.1 at 396 MHz
CPU:   Temperature 46 C
Reset cause: POR
Board: MX6UL 14x14 EVK
I2C:   ready
DRAM:  512 MiB
force_idle_bus: sda=0 scl=0 sda.gp=0x1d scl.gp=0x1c
NAND:  256 MiB
MMC:   FSL_SDHC: 0
*** Warning - bad CRC, using default environment

Display: TFT43AB (480x272)
Video: 480x272x24
In:    serial
Out:   serial
Err:   serial
Net:   FEC1
Error: FEC1 address not set.

Normal Boot
Hit any key to stop autoboot:  0
=> printenv
baudrate=115200
bootargs=console=ttymxc0,115200 ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
bootcmd=nand read ${loadaddr} ${kernel_addr} 0x800000;nand read ${fdt_addr} ${dtb_addr} 0x100000;bootz ${loadaddr} - ${fdt_addr}
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=3
console=ttymxc0
dtb_addr=0x00E00000
ethact=FEC1
ethprime=FEC
fdt_addr=0x83000000
fdt_high=0xffffffff
initrd_addr=0x83800000
initrd_high=0xffffffff
kernel_addr=0x00400000
loadaddr=0x80800000
mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage.iSerialNumber="" mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
panel=TFT43AB

Environment size: 1072/1048572 bytes

U-Boot 2015.04-imx_v2015.04_3.14.52_1.1.0_ga+g6cf684a (Dec 16 2016 - 05:20:17)

CPU:   Freescale i.MX6UL rev1.1 at 396 MHz
CPU:   Temperature 43 C
Reset cause: POR
Board: MX6UL 14x14 EVK
I2C:   ready
DRAM:  512 MiB
force_idle_bus: sda=0 scl=0 sda.gp=0x1d scl.gp=0x1c
NAND:  256 MiB
MMC:   FSL_SDHC: 0
Display: TFT43AB (480x272)
Video: 480x272x24
In:    serial
Out:   serial
Err:   serial
Net:   FEC1
Error: FEC1 address not set.

Normal Boot
Hit any key to stop autoboot:  0
=> printenv
baudrate=115200
bootargs=console=ttymxc0,115200 ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
bootcmd=nand read ${loadaddr} ${kernel_addr} 0x800000;nand read ${fdt_addr} ${dtb_addr} 0x100000;bootz ${loadaddr} - ${fdt_addr}
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=3
console=ttymxc0
dtb_addr=0x00E00000
ethact=FEC1
ethprime=FEC
fdt_addr=0x83000000
fdt_high=0xffffffff
initrd_addr=0x83800000
initrd_high=0xffffffff
kernel_addr=0x00400000
loadaddr=0x80800000
mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage.iSerialNumber="" mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
panel=TFT43AB

Environment size: 1072/1048572 bytes

root@M300:/tmp# cat /etc/fw_env.config
# MTD device name    Device offset     Env. size         Flash sector size
/dev/mtd1            0x00000000        0x00100000        0x00100000
root@M300:/tmp# images/fw_printenv
baudrate=115200
bootargs=console=ttymxc0,115200 ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
bootcmd=nand read ${loadaddr} ${kernel_addr} 0x800000;nand read ${fdt_addr} ${dtb_addr} 0x100000;bootz ${loadaddr} - ${fdt_addr}
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=3
console=ttymxc0
dtb_addr=0x00E00000
ethact=FEC1
ethprime=FEC
fdt_addr=0x83000000
fdt_high=0xffffffff
initrd_addr=0x83800000
initrd_high=0xffffffff
kernel_addr=0x00400000
loadaddr=0x80800000
mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage.iSerialNumber="" mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
panel=TFT43AB

root@M300:/tmp# ./fw_printenv bootargs
bootargs=console=ttymxc0,115200 ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)
root@M300:/tmp# ./fw_setenv bootargs 'console=ttymxc0,115200 ubi.mtd=9 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)'
root@M300:/tmp# ./fw_printenv bootargs
bootargs=console=ttymxc0,115200 ubi.mtd=9 root=ubi0:rootfs rootfstype=ubifs mtdparts=gpmi-nand:3m(boot),1m(boot_env),10m(kernel_a),2m(dtb_a),96m(rootfs_a),16m(config_a),4m(misc),10m(kernel_b),2m(dtb_b),96m(rootfs_b),-(config_b)

...
11 cmdlinepart partitions found on MTD device gpmi-nand
Creating 11 MTD partitions on "gpmi-nand":
0x000000000000-0x000000300000 : "boot"
0x000000300000-0x000000400000 : "boot_env"
0x000000400000-0x000000e00000 : "kernel_a"
0x000000e00000-0x000001000000 : "dtb_a"
0x000001000000-0x000007000000 : "rootfs_a"
0x000007000000-0x000008000000 : "config_a"
0x000008000000-0x000008400000 : "misc"
0x000008400000-0x000008e00000 : "kernel_b"
0x000008e00000-0x000009000000 : "dtb_b"
0x000009000000-0x00000f000000 : "rootfs_b"
0x00000f000000-0x000010000000 : "config_b"
...
UBI: attaching mtd9 to ubi0
...
UBI: scanning is finished
UBI: attached mtd9 (name "rootfs_b", size 96 MiB) to ubi0
...