mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
ce2f9def82
Explain how to flash the eMMC and how to boot from it. Signed-off-by: Breno Lima <breno.lima@nxp.com> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
142 lines
3.2 KiB
Text
142 lines
3.2 KiB
Text
How to use and build U-Boot on mx6sabresd:
|
|
----------------------------------
|
|
|
|
Currently there are four methods for booting mx6sabresd boards:
|
|
|
|
1. Booting from SD card via normal U-Boot (u-boot.imx)
|
|
|
|
2. Booting from eMMC via normal U-Boot
|
|
|
|
3. Booting via SPL (SPL and u-boot.img)
|
|
|
|
4. Booting via Falcon mode (SPL launches the kernel directly)
|
|
|
|
|
|
1. Booting from SD card via normal U-Boot
|
|
-----------------------------------------
|
|
|
|
$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd)
|
|
|
|
or
|
|
|
|
$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd)
|
|
|
|
$ make
|
|
|
|
This will generate the image called u-boot.imx.
|
|
|
|
- Flash the u-boot.imx binary into the SD card:
|
|
|
|
$ sudo dd if=u-boot.imx of=/dev/sdb bs=1K seek=1 && sync
|
|
|
|
|
|
2. Booting from eMMC via normal U-Boot
|
|
--------------------------------------
|
|
|
|
$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd)
|
|
|
|
or
|
|
|
|
$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd)
|
|
|
|
$ make
|
|
|
|
This will generate the image called u-boot.imx.
|
|
|
|
- Flash the u-boot.imx binary into the eMMC:
|
|
|
|
Set SW6 to download mode: 00001100
|
|
|
|
Plug a usb cable to USB-OTG and load the u-boot image using the imx_usb_loader
|
|
tool (https://github.com/boundarydevices/imx_usb_loader):
|
|
|
|
$ sudo ./imx_usb u-boot.imx
|
|
|
|
In U-boot change the eMMC partition config:
|
|
|
|
=> mmc partconf 2 1 0 0
|
|
|
|
Mount the eMMC in the host PC:
|
|
|
|
=> ums 0 mmc 2
|
|
|
|
Flash the u-boot.imx binary
|
|
|
|
$ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1 && sync
|
|
|
|
Set SW6 to eMMC 8-bit boot: 11010110
|
|
|
|
|
|
3. Booting via SPL
|
|
------------------
|
|
|
|
Other method for building U-Boot on mx6qsabresd and mx6qpsabresd is
|
|
through SPL. In order to do so:
|
|
|
|
$ make mx6sabresd_spl_defconfig
|
|
$ make
|
|
|
|
This will generate the SPL image called SPL and the u-boot.img.
|
|
|
|
- Flash the SPL image into the SD card:
|
|
|
|
$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync
|
|
|
|
- Flash the u-boot.img image into the SD card:
|
|
|
|
$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 && sync
|
|
|
|
|
|
4. Booting via Falcon mode
|
|
--------------------------
|
|
|
|
$ make mx6sabresd_spl_defconfig
|
|
$ make
|
|
|
|
This will generate the SPL image called SPL and the u-boot.img.
|
|
|
|
- Flash the SPL image into the SD card:
|
|
|
|
$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 oflag=sync status=none && sync
|
|
|
|
- Flash the u-boot.img image into the SD card:
|
|
|
|
$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 oflag=sync status=none && sync
|
|
|
|
Create a partition for root file system and extract it there:
|
|
|
|
$ sudo tar xvf rootfs.tar.gz -C /media/root
|
|
|
|
The SD card must have enough space for raw "args" and "kernel".
|
|
To configure Falcon mode for the first time, on U-Boot do the following commands:
|
|
|
|
- Setup the IP server:
|
|
|
|
# setenv serverip <server_ip_address>
|
|
|
|
- Download dtb file:
|
|
|
|
# dhcp ${fdt_addr} imx6q-sabresd.dtb
|
|
|
|
- Download kernel image:
|
|
|
|
# dhcp ${loadaddr} uImage
|
|
|
|
- Write kernel at 2MB offset:
|
|
|
|
# mmc write ${loadaddr} 0x1000 0x4000
|
|
|
|
- Setup kernel bootargs:
|
|
|
|
# setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 rootfstype=ext4 rootwait quiet rw"
|
|
|
|
- Prepare args:
|
|
|
|
# spl export fdt ${loadaddr} - ${fdt_addr}
|
|
|
|
- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)
|
|
|
|
# mmc write 18000000 0x800 0x800
|
|
|
|
- Press KEY_VOL_UP key, power up the board and then SPL binary will
|
|
launch the kernel directly.
|