27.08.2024 00:53, Vagrant Cascadian wrote:
On 2023-12-18, Michael Tokarev wrote:
If we're to go this route, will ask opensbi maintainer(s) to create symlinks to
opensbi firmware in /usr/share/qemu/ directory. This will involve Break/Replace
of the old qemu-system-data package.
I could do that with all the Breaks/Replaces dance in opensbi ... but
would it also be an option to just put the symlinks in qemu-system-data
and depend or recommend on opensbi to avoid the Breaks/Replaces dance?
Actually.. I can't remember exactly why I asked for the (sym)links.
For an optional firmware (like it was with sgabios for example), I can't
ship such symlink on qemu side because it becomes dangling if the package
isn't installed, and users complain, - so it should be the optional pkg
who provides the symlink to itself, named after what the qemu expects...
Aha. Now I start to realize what's going on.
This is for qemu-system-riscv64. Which is part of qemu-system-misc. So
for most setups, this file wont be needed, and "can" be optional, - as
long as you don't run qemu-system-riscv64.
I can make qemu-system-data depend on opensbi, with the symlinks et al, -
this way it will be exactly the way it is now, except of the extra
package installed which was just a file (two actually) inside.
Or I can split qemu-system-riscv out of qemu-system-misc and make *that*
one depend on opensbi. But this way I can't merge all qemu-system-foo
packages back into single qemu-system which I dreamed to do for quite
some time...
So, the reason why I thought about symlink in qemu namespace provided by
opensbi is to be able to make opensbi optional, not because something in
there changes often.
Maybe I can, at least, make qemu produce a warning when it tries to load
opensbi firmware and can't - to install appropriate package.
Ok. This one needs a bit more thoughts.
Now a more interesting question. Does opensbi provide all necessary files
for qemu? Right now, qemu-system-data ships these files:
262K Aug 17 10:53 usr/share/qemu/opensbi-riscv32-generic-fw_dynamic.bin
265K Aug 17 10:53 usr/share/qemu/opensbi-riscv64-generic-fw_dynamic.bin
Apparently this is not what opensbi package ships. Maybe this one:
113K Nov 25 2022 usr/lib/riscv64-linux-gnu/opensbi/generic/fw_dynamic.bin
is okay as opensbi-riscv64-generic-fw_dynamic.bin but from the size it does
not look like it is, or maybe I just forgot to run strip on the elf part
in my build.
But apparently it lacks opensbi-riscv32-generic-fw_dynamic.bin which qemu
ships too.
I don't know how the 32bit version is used. I build qemu-system-riscv32
binary, and that one does load opensbi-riscv32-generic-fw_dynamic.bin and
fails if it is not present. But how useful it is, - I don't know.
Hmm...
