ARM: legoev3: update boot script to load uEnv.txt and .dtb
This updates the LEGO MINDSTORMS EV3 boot script to try loading a uEnv.txt file and a da850-lego-ev3.dtb device tree during boot. Signed-off-by: David Lechner <david@lechnology.com>
This commit is contained in:
David Lechner
Tom Rini
parent
71eb63e7ee
commit
f203a479e7
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@ -9,14 +9,34 @@ Booting
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=======
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The EV3 contains a bootloader in EEPROM that loads u-boot.bin from address 0x0
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of the spi flash memory. Using the default configuration, u-boot will check to
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see if there is a boot.scr file on the first FAT partition of the mmc. If there
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is, it will run the script and boot the kernel from the uImage file also in
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the FAT partition. Otherwise, it will load a kernel and rootfs from the flash.
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The kernel must be stored at address 0x50000 on the flash and have a maximum
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size of 4MiB. The rootfs must be a squasfs image and stored at 0x450000 in the
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flash and have a maximum size of 10MiB. The flash starting at 0xE50000 is
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reserved for user data.
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of the SPI flash memory (with a size of 256KiB!). Because the EEPROM is read-
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only and it takes care of low level configuration (PLL and DDR), we don't use
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U-Boot to produce an SPL image.
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Using the default configuration, U-Boot had a boot scrips that works as follows:
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* Check to see if microSD card is present
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* If it is, try to load boot.scr from the first FAT partition
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* If loading boot.scr was successful, run it
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* Otherwise, try loading uEnv.txt
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* If loading uEnv.txt was successful, import it
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* If there is a uenvcmd variable (from uEnv.txt), run it
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* Try to load uImage from the first FAT partition
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* If it was successful, try to load da850-lego-ev3.dtb
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* If loading uImage was successful, boot it (DT is optional)
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* If none of the above was successful, try booting from flash
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Suggested Flash Memory Layout
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=============================
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The following is based on the default U-Boot configuration:
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| Image (file) | Start Addr. | Max. Size |
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+--------------------+-------------+-------------------+
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| u-boot.bin | 0x0 | 0x40000 (256KiB) |
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| da850-lego-ev3.dtb | 0x40000 | 0x10000 (64KiB) |
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| uImage | 0x50000 | 0x400000 (4MiB) |
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| rootfs (squashfs) | 0x450000 | 0xa00000 (10MiB) |
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Writing image to flash
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======================
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@ -84,34 +84,60 @@
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"if run loadbootscr; then " \
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"run bootscript; " \
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"else " \
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"if run loadbootenv; then " \
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"echo Loaded env from ${bootenvfile};" \
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"run importbootenv;" \
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"fi;" \
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"if test -n $uenvcmd; then " \
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"echo Running uenvcmd...;" \
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"run uenvcmd;" \
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"fi;" \
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"if run loadimage; then " \
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"run mmcargs; " \
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"if run loadfdt; then " \
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"echo Using ${fdtfile}...;" \
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"run fdtfixup; " \
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"run fdtboot; "\
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"fi; " \
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"run mmcboot; " \
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"else " \
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"run flashargs; " \
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"run flashboot; " \
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"fi; " \
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"fi; " \
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"else " \
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"fi; "\
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"run flashargs; " \
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"run flashboot; " \
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"fi"
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"run flashboot"
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#define CONFIG_EXTRA_ENV_SETTINGS \
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"bootenvfile=uEnv.txt\0" \
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"fdtfile=da850-lego-ev3.dtb\0" \
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"memsize=64M\0" \
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"filesyssize=10M\0" \
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"verify=n\0" \
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"console=ttyS1,115200n8\0" \
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"bootscraddr=0xC0600000\0" \
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"fdtaddr=0xC0600000\0" \
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"loadaddr=0xC0007FC0\0" \
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"filesysaddr=0xC1180000\0" \
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"fwupdateboot=mw 0xFFFF1FFC 0x5555AAAA; reset\0" \
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"mmcargs=setenv bootargs mem=${memsize} console=${console} root=/dev/mmcblk0p2 rw rootwait lpj=747520\0" \
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"importbootenv=echo Importing environment...; " \
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"env import -t ${loadaddr} ${filesize}\0" \
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"loadbootenv=fatload mmc 0 ${loadaddr} ${bootenvfile}\0" \
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"mmcargs=setenv bootargs console=${console} root=/dev/mmcblk0p2 rw " \
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"rootwait ${optargs}\0" \
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"mmcboot=bootm ${loadaddr}\0" \
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"flashargs=setenv bootargs mem=${memsize} initrd=${filesysaddr},${filesyssize} root=/dev/ram0 rw rootfstype=squashfs console=${console} lpj=747520\0" \
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"flashboot=sf probe 0; sf read ${loadaddr} 0x50000 0x400000; sf read ${filesysaddr} 0x450000 0xA00000; bootm ${loadaddr}\0" \
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"flashargs=setenv bootargs initrd=${filesysaddr},${filesyssize} " \
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"root=/dev/ram0 rw rootfstype=squashfs console=${console} " \
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"${optargs}\0" \
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"flashboot=sf probe 0; " \
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"sf read ${fdtaddr} 0x40000 0x10000; " \
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"sf read ${loadaddr} 0x50000 0x400000; " \
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"sf read ${filesysaddr} 0x450000 0xA00000; " \
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"run fdtfixup; " \
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"run fdtboot\0" \
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"loadimage=fatload mmc 0 ${loadaddr} uImage\0" \
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"loadfdt=fatload mmc 0 ${fdtaddr} ${fdtfile}\0" \
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"fdtfixup=fdt addr ${fdtaddr}; fdt resize; fdt chosen\0" \
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"fdtboot=bootm ${loadaddr} - ${fdtaddr}\0" \
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"loadbootscr=fatload mmc 0 ${bootscraddr} boot.scr\0" \
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"bootscript=source ${bootscraddr}\0" \
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"bootscript=source ${bootscraddr}\0"
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#ifdef CONFIG_CMD_BDI
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#define CONFIG_CLOCKS
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