mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-14 23:33:00 +00:00
d27748b7cb
Falcon mode allows the SPL to load and jump directly to the kernel, without loading U-Boot proper. Add detailed step by step on how to use Falcon mode on pico-imx6ul. Signed-off-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
159 lines
4.5 KiB
Text
159 lines
4.5 KiB
Text
How to Update U-Boot on Pico-imx6ul board
|
|
-----------------------------------------
|
|
|
|
Required software on the host PC:
|
|
|
|
- imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader
|
|
|
|
- dfu-util: http://dfu-util.sourceforge.net/releases/
|
|
|
|
Build U-Boot for Pico:
|
|
|
|
$ make mrproper
|
|
$ make pico-imx6ul_defconfig
|
|
$ make
|
|
|
|
This generates the SPL and u-boot.img binaries.
|
|
|
|
1. Loading U-Boot via USB Serial Download Protocol
|
|
|
|
Note: This method is convenient for development purposes.
|
|
If the eMMC has already a U-Boot flashed with DFU support then
|
|
the user can go to step 2 below in order to update U-Boot.
|
|
|
|
Put pico board in USB download mode (refer to the document
|
|
http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdf
|
|
page 15).
|
|
|
|
Connect a USB to serial adapter between the host PC and pico.
|
|
|
|
Connect a USB cable between the OTG pico port and the host PC.
|
|
|
|
Open a terminal program such as minicom.
|
|
|
|
Copy SPL and u-boot.img to the imx_usb_loader folder.
|
|
|
|
Load the SPL binary via USB:
|
|
|
|
$ sudo ./imx_usb SPL
|
|
|
|
Load the u-boot.img binary via USB:
|
|
|
|
$ sudo ./imx_usb u-boot.img
|
|
|
|
Then U-Boot starts and its messages appear in the console program.
|
|
|
|
Use the default environment variables:
|
|
|
|
=> env default -f -a
|
|
=> saveenv
|
|
|
|
2. Flashing U-Boot into the eMMC
|
|
|
|
Run the DFU agent so we can flash the new images using dfu-util tool:
|
|
|
|
=> dfu 0 mmc 0
|
|
|
|
Flash SPL and u-boot.img into the eMMC running the following commands on a PC:
|
|
|
|
$ sudo dfu-util -D SPL -a spl
|
|
|
|
$ sudo dfu-util -D u-boot.img -a u-boot
|
|
|
|
Remove power from the pico board.
|
|
|
|
Put pico board into normal boot mode.
|
|
|
|
Power up the board and the new updated U-Boot should boot from eMMC.
|
|
|
|
Booting in Falcon mode
|
|
======================
|
|
|
|
Generate a uImage kernel:
|
|
|
|
$ make imx_v6_v7_defconfig (Using the default imx_v6_v7_defconfig configuration
|
|
just for an example. In order to boot faster the user should customize the
|
|
defconfig by only enabling the minimal required drivers).
|
|
|
|
$ make -j4 uImage LOADADDR=0x80800000
|
|
|
|
$ cp arch/arm/boot/uImage /tftpboot
|
|
$ cp arch/arm/boot/dts/imx6ul-pico-hobbit.dtb /tftpboot
|
|
|
|
In the U-Boot prompt:
|
|
|
|
Setup the server and board IP addresses:
|
|
=> setenv serverip 192.168.0.10
|
|
=> setenv ipaddr 192.168.0.11
|
|
|
|
Get the dtb file:
|
|
=> tftp ${fdt_addr} imx6ul-pico-hobbit.dtb
|
|
|
|
Get the kernel:
|
|
=> tftp ${loadaddr} uImage
|
|
|
|
Write the kernel at 2MB offset:
|
|
=> mmc write ${loadaddr} 0x1000 0x4000
|
|
|
|
Setup the bootargs:
|
|
=> setenv bootargs 'console=ttymxc5,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait rw'
|
|
|
|
Prepare args:
|
|
=> spl export fdt ${loadaddr} - ${fdt_addr}
|
|
## Booting kernel from Legacy Image at 82000000 ...
|
|
Image Name: Linux-4.19.0-rc2-next-20180905-0
|
|
Image Type: ARM Linux Kernel Image (uncompressed)
|
|
Data Size: 8365608 Bytes = 8 MiB
|
|
Load Address: 80800000
|
|
Entry Point: 80800000
|
|
Verifying Checksum ... OK
|
|
## Flattened Device Tree blob at 83000000
|
|
Booting using the fdt blob at 0x83000000
|
|
Loading Kernel Image ... OK
|
|
Using Device Tree in place at 83000000, end 83009c63
|
|
subcommand not supported
|
|
subcommand not supported
|
|
Using Device Tree in place at 83000000, end 8300cc63
|
|
Argument image is now in RAM: 0x83000000
|
|
|
|
Write 1MB of args data (0x800 sectors) to 1MB offset (0x800 sectors):
|
|
|
|
=> mmc write ${fdt_addr} 0x800 0x800
|
|
|
|
In order to boot with Falcon mode, activate the CONFIG_SPL_OS_BOOT
|
|
option in the defconfig
|
|
|
|
--- a/configs/pico-hobbit-imx6ul_defconfig
|
|
+++ b/configs/pico-hobbit-imx6ul_defconfig
|
|
@@ -53,3 +53,4 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0525
|
|
CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
|
|
CONFIG_CI_UDC=y
|
|
CONFIG_OF_LIBFDT=y
|
|
+CONFIG_SPL_OS_BOOT=y
|
|
|
|
Then rebuild U-Boot:
|
|
|
|
$ make pico-hobbit-imx6ul_defconfig
|
|
$ make -j4
|
|
|
|
Launch UMS:
|
|
=> ums 0 mmc 0
|
|
|
|
Flash the new binaries:
|
|
|
|
$ sudo dd if=SPL of=/dev/sdX bs=1k seek=1; sync
|
|
$ sudo dd if=u-boot.img of=/dev/sdX bs=1k seek=69; sync
|
|
|
|
And then SPL binary will load and jump directly to the kernel:
|
|
|
|
U-Boot SPL 2018.09-rc2-00156-g8c46f15-dirty (Sep 05 2018 - 16:24:05 -0300)
|
|
Trying to boot from MMC1
|
|
[ 0.000000] Booting Linux on physical CPU 0x0
|
|
[ 0.000000] Linux version 4.19.0-rc2-next-20180905-00001-gb805e2d (fabio@fabio-Latitude-E5450) (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9)) #533 SMP Wed Sep 5 16:21:03 -03 2018
|
|
[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
|
|
[ 0.000000] CPU: div instructions available: patching division code
|
|
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
|
|
[ 0.000000] OF: fdt: Machine model: Technexion Pico i.MX6UL Board
|
|
[ 0.000000] Memory policy: Data cache writealloc
|
|
[ 0.000000] cma: Reserved 64 MiB at 0x8c000000
|
|
...
|