54 lines
1.3 KiB
Batchfile
54 lines
1.3 KiB
Batchfile
# static config
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setenv boot_partition_a 2
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setenv boot_partition_b 3
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setenv boot_limit 2
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setenv boot_partition_base "/dev/mmcblk0p"
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# set default values if env not set
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if printenv boot_count; then
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else
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setenv boot_count 1
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fi
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if printenv boot_partition; then
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# check if valid partition a or b
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if test ${boot_partition} -ne ${boot_partition_a} && test ${boot_partition} -ne ${boot_partition_b}; then
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setenv boot_partition ${boot_partition_a}
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fi
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else
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setenv boot_partition ${boot_partition_a}
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fi
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# switch boot partition if boot count exceed limit
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if test ${boot_count} -ge ${boot_limit}; then
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echo "!!! Boot limit exceed !!!"
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if test ${boot_partition} -eq ${boot_partition_a}; then
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setenv boot_partition ${boot_partition_b}
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else
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setenv boot_partition ${boot_partition_a}
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fi
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setenv boot_count 0
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echo "Switch active partition to ${boot_partition_base}${boot_partition}"
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fi
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# increase boot_count
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setexpr boot_count ${boot_count} + 1
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# store settings
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saveenv
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# load bootargs from pi boot loader
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fdt addr ${fdt_addr} && fdt get value bootargs /chosen bootargs
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# overwrite boot partition
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setexpr bootargs sub " root=[^ ]+" " root=${boot_partition_base}${boot_partition}" "${bootargs}"
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# load kernel and boot
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ext4load mmc 0:${boot_partition} ${kernel_addr_r} /boot/uImage
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bootm ${kernel_addr_r} - ${fdt_addr}
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reset |