25 lines
1.4 KiB
Markdown
25 lines
1.4 KiB
Markdown
# update-uboot: Self-contained, Online u-boot updater
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update-uboot is a completely self-contained way to update u-boot. The generated binary includes the updated u-boot binary *and* Linux kernel module to allow
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rw access to the (often protected) /dev/mtd0 partition.
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## Installation
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1. Install zig (https://ziglang.org/download/)
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- Requires sentinel-terminated slices, only in master (as of 2020-01-13) or 0.6.0+
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2. `git clone https://git.sr.ht/~monadnock/zig-mtd`
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3. `zig build`
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## Modification
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This code only currently supports mipsel out of the box. The only parts specific to mipsel are:
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- *mtd-rw.ko*; The embedded kernel module is compiled for mipsel. You can replace this file with a version compiled for your arch, or comment out the function if you don't require it.
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- *uboot-feb2019.bin*: Same story. This is the version of u-boot I needed for mt7628 product. You'll almost certainly want to replace this file. Ask your doctor what version of u-boot is right for you
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- The [ioctl numbers used to ERASE and UNLOCK the mtd](https://git.sr.ht/~monadnock/zig-mtd/tree/master/src/mtd.zig#L8) are arch specific
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> zig couldn't grok the nested ioctl #define horrors from the mtd headers. The easiest way I've found to determine these magic numbers is to compile the mtd-magic.c file in the repo with your target toolchain and run it on the target. It'll print out the macro expansions (e.g. `mipsel-openwrt-linux-gcc -o mtd-magic mtd-magic.c`)
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