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| author | Kimplul <kimi.h.kuparinen@gmail.com> | 2023-05-29 21:31:09 +0300 |
|---|---|---|
| committer | Kimplul <kimi.h.kuparinen@gmail.com> | 2023-05-29 21:31:09 +0300 |
| commit | 3ace1ddd76b9c04f3ed23883de6279b4485612e8 (patch) | |
| tree | 2f4af69d70967c2455cb83d8c18a5416c8d1b54d /README.md | |
| parent | b7f53b9a9001708dea5303faf52f1b508eefb712 (diff) | |
| download | kmi-3ace1ddd76b9c04f3ed23883de6279b4485612e8.tar.gz kmi-3ace1ddd76b9c04f3ed23883de6279b4485612e8.zip | |
start trying to boot on visionfive 2
+ Not bootable quite yet. Among other things, I couldn't
get the current starfive u-boot fork to boot, so
try adding support for booting with precompiled u-boot
via the `go` command. Initial testing with qemu shows that
this should be possible, and if it works, might be useful
in the (far) future with other slightly janky SBCs.
Also, NS16550 is 8250-based, and I'm really only using the base
8250, so rename and add visionfive 2 uart to list of compatibles.
Visionfive 2 is still completely untested.
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 18 |
1 files changed, 17 insertions, 1 deletions
@@ -27,7 +27,7 @@ Open `docs/output/html/index.html` in your favorite web browser. + `RELEASE=<0/1>`: Enable optimizations when set to `1`. Default is `0`. Note that with `RELEASE=1` the built in serial driver is disabled, as eventually -I'd like to provide it as a separate userspace driver. At the moment only NS16550A and +I'd like to provide it as a separate userspace driver. At the moment only 8250 and compatible serial devices are supported. + `LLVM=<0/1>`: Use LLVM toolchain when set to `1`. Default is `0`. @@ -36,6 +36,22 @@ Note that due to some bugs in the toolchain, LTO is disabled with `RELEASE=1`. + `UBSAN=<0/1>`: Enable undefined behavior sanitizer, outputs a number of warnings at runtime when undefined behavior is detected. Only available with `RELEASE=0`. ++ `GENERIC_UBOOT=<0/1>`: Compile for use with generic u-boot. This allows +booting the kernel through u-boot's `go` command. This would in theory allow +using essentially any precompiled u-boot as a bootloader, but requires some +extra effort by the user to manage loading different parts to where they should +go. I should probably come up with a full example, but approximately: + +1. Load `kmi.bin` to address `A` +2. Load `initrd` to address `B` +3. Load FDT to address `C` (either provided by u-boot or a separate file) +4. Add `initrd` to FDT's `chosen` node +5. Boot with `go ${A} ${C}`. + +Note that u-boot likes to skip the `0x` prefix for +hexadecimal values, which can confuse my string converter. +Check that the strings you pass to `go` have their correct prefixes. + + `run`: Load a test program into `qemu` and run it. Requires some outside support at the moment, please see [kmi-example](https://github.com/Kimplul/kmi-example). This command might eventually be moved out of this repo. |