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authorFabio Estevam <festevam@gmail.com>2018-09-13 16:57:06 -0300
committerStefano Babic <sbabic@denx.de>2018-09-14 15:22:52 +0200
commitd27748b7cb3b7f447ef7d7d7c6cfe91852cd14e6 (patch)
treef6a050067d8cbf217ef75f220d3602ed180f5f86
parent9ddd1cd596b5d825a53265c267d9322f2af0f4d1 (diff)
downloadu-boot-d27748b7cb3b7f447ef7d7d7c6cfe91852cd14e6.tar.gz
pico-imx6ul: Add instructions for booting in Falcon mode
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>
-rw-r--r--board/technexion/pico-imx6ul/README92
1 files changed, 92 insertions, 0 deletions
diff --git a/board/technexion/pico-imx6ul/README b/board/technexion/pico-imx6ul/README
index 66dc977d49..1cabd90759 100644
--- a/board/technexion/pico-imx6ul/README
+++ b/board/technexion/pico-imx6ul/README
@@ -65,3 +65,95 @@ 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
+...