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42 lines
2.4 KiB
Plaintext
42 lines
2.4 KiB
Plaintext
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# distro-config bootscript
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# - use only well-known variable names provided by U-Boot Distro boot
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# - devtype - device type script run from (mmc|usb|scsi)
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# - devnum - device number script run from (0 based int)
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# - distro_bootpart - partition script run from (0 based int)
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# - prefix - directory boot script was found in
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# - kernel_addr_r - address to load kernel image to
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# - fdt_addr_r - address to load dtb to
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# - ftdcontroladdr - address dtb is at
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# - fdt_file{1,2,3,4,5} name of fdt to load
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# - fdt_overlays - list of fdt overlay files to load and apply
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echo "Gateworks Venice OpenWrt Boot script v1.0"
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# determine root device using PARTUUID:
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# - this avoids any difference beteween uboot's device names/numbers
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# not matching Linux as device enumeration is not a set API.
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# - PARTUUID is disk UUID concatenated with partition number
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# - for MBR disk UUID is unique disk id at offset 440
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# - for GPT disk UUID is GPT UUID
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# - for OpenWrt the squasfs rootfs is not readable by U-Boot so we have
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# a 'boot' partition containing bootscript kernel dtbs followed by the rootfs
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# partition, therefore we add 1 to the current partition
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setexpr rootpart ${distro_bootpart} + 1 # root on 'next' partition
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part uuid ${devtype} ${devnum}:${rootpart} uuid
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setenv bootargs ${bootargs} console=${console} root=PARTUUID=${uuid} rootfstype=squashfs,ext4,f2fs rootwait
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# load dtb (we try fdt_file and then fdt_file{1,2,3,4,5})
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echo "loading DTB..."
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setenv fdt_addr
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setenv fdt_list $fdt_file $fdt_file1 $fdt_file2 $fdt_file3 $fdt_file4 $fdt_file5
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setenv load_fdt 'echo Loading $fdt...; load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${fdt} && setenv fdt_addr ${fdt_addr_r}'
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setenv apply_overlays 'fdt addr $fdt_addr_r && fdt resize && for fdt in "$fdt_overlays"; do load ${devtype} ${devnum}:${distro_bootpart} $loadaddr $prefix/$fdt && fdt apply $loadaddr && echo applied $prefix/$fdt; done'
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for fdt in ${fdt_list}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${fdt}; then run load_fdt; fi; done
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if test -z "$fdt_addr"; then echo "Warning: Using bootloader DTB"; setenv fdt_addr $fdtcontroladdr; fi
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if test -n "$fdt_overlays"; then echo "Applying overlays"; run apply_overlays; fi
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if test -n "$fixfdt"; then echo "Adjusting FDT"; run fixfdt; fi
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# load and boot kernel
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echo "loading kernel..."
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load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} ${prefix}Image &&
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booti ${kernel_addr_r} - ${fdt_addr}
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