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hard thinking or hardly thinking

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Daniel Barlow 2023-12-09 16:46:09 +00:00
parent 317457f582
commit bb8e974c2b
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THOUGHTS.txt
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@ -3371,3 +3371,50 @@ image in the only partition, and that partition to be bootable. Then
run-liminix-vm gets a --disk-image option which causes it to use run-liminix-vm gets a --disk-image option which causes it to use
U-Boot instead of direct load (can we wrap it with something that sets U-Boot instead of direct load (can we wrap it with something that sets
up the paths so it can find u-boot and qemu?) up the paths so it can find u-boot and qemu?)
ok, we're going to define outputs.diskimage which is like
outputs.flashimage but it has a partition table. Then we can make a
qemu configuration with an ext4 filesystem and defaultOutput="diskimage"
and config.boot.loader.extlinux.enable = true
sfdisk default behaviour for GPT partitioned disk is to start at sector 2048
(sectors are 512 bytes)
Device Start End Sectors Size Type
disk.bin1 2048 14335 12288 6M Linux filesystem
Tue Dec 5 23:54:22 GMT 2023
Need mbr not gpt. At least, it takes up less space and it doesn't
inveigle us into EFI boot.
This is close to working except that it doesn't want to boot a uimage
Enter choice: 1
1: Liminix
Retrieving file: /boot/initramfs
Retrieving file: /boot/kernel.gz
append: console=ttyAMA0 panic=10 oops=panic init=/bin/init loglevel=8 root=/dev/mtdblock0 rootfstype=ext4 fw_devlink=off
zimage: Bad magic!
Thu Dec 7 19:33:02 GMT 2023
virtio devices don't have standard major/minor so we can't create
device nodes for them at build time. Either we mount devtmpfs in the
initramfs (do we then have to move it to /target?) or we parse the
/sys/block/vda/vda1/dev node to get 253:1 or whatever
Fri Dec 8 16:36:07 GMT 2023
We'd like to remove the ugly special handling of qemu dtb. Here are
some thoughts
1) qemu provides its guest the correct DTB for the configured hardware.
This is a desirable thing and we wish more platforms did it, so would
like not to replace it with a static dtb if we can avoid that
2) so we need some kind of config option that says "platform provides the
device tree" (or alternatively, "we need a static dtb, platform doesn't
provide it").
config.boot.platformProvidesDeviceTree