Hi,
thanks for that info, but I think there's a misunderstanding.
The kernel command line "init=" is only evaluated if the kernel boots
without initrd or initramfs. Initramfs does always need /init (such as
an initrd always needs /linuxrc) [1]. This is only relevant to the init
system used after the root fs is mounted. This is supported by man 7
bootparam which says
'init=...'
This sets the initial command to be executed by the kernel. If
this is not set, or cannot be found, the kernel will try /sbin/init, then
/etc/init, then /bin/init, then /bin/sh and panic if
all of this fails.
I have also tested this behavior by running Genode on Linux with
init=/genode/core which still resulted in the kernel loading /init from
the initramfs.
Sorry for the slight off topic. If I have any mistakes in my thoughts
please correct me.
Regards,
Johannes
[1]: https://wiki.debian.org/initramfs
On 10/24/17 18:59, Nobody III wrote:
Also, you could use the kernel command line, e.g. "init=/genode/core".
On Tue, Oct 24, 2017 at 10:20 AM, Johannes Kliemann
<johannes.kliem...@tu-dresden.de
<mailto:johannes.kliem...@tu-dresden.de>> wrote:
Hi again,
I fixed the file naming and I don't need to rename the files anymore
(I forgot to prepend the correct directory in the cpio archive).
With the cpio initramfs I chdir into /genode from the ROM session
and correctly find the libraries. Yet the segfault and warning I
described in the last mail still appear.
To reproduce the problem with the current state, check out [1]. The
build configuration is the same as in the last mail.
Regards,
Johannes
[1]:
https://github.com/jklmnn/genode/commit/2c899063f2bad1318bbde88f2472e017fc72be34
<https://github.com/jklmnn/genode/commit/2c899063f2bad1318bbde88f2472e017fc72be34>
On 10/24/17 11:27, Johannes Kliemann wrote:
Hi,
while booting Genode directly on Linux I encountered the problem
that
Linux requires to call `/init` in the initramfs. Unfortunately
Genode
requires to call `core` which loads `init` so renaming core to init
isn't enough.
I renamed init to init2 core to init and called it with
"label=init2"
which works at first (core finds all ROM sessions) but then
segfaults
with "init2[45]: segfault at 7f11c473b128 ip 00007f11c4645f40 sp
00007ffc1c8c15f8 error 4 in ld.lib.so
<http://ld.lib.so>[7f11c45c5000+95000]" and the
warning "Warning: blocking canceled in entrypoint constructor".
This warning was addressed on Linux before in [0] and fixed in
ad2859b6b9dae96c48329eebc0a73527ba4deb9b. I have already
included this
patch.
To boot Genode on Linux with this behaviour, checkout [1] and change
"KERNEL_RUN_OPT(linux) := --include power_on/linux --include
log/linux"
to
"KERNEL_RUN_OPT(linux) := $(QEMU_RUN_OPT)"
in your etc/build.conf (with linux as kernel ofc).
Beside renaming I also tried to make the ROM session chdir into
a sub
directory or to prepend this directory to the binary name.
Neither of
made Genode correctly find the binaries. I have to say that
Linux is not
booting into a real fs but is using a initramfs which consists
of a cpio
archive.
What would be the way to go to either rename the binaries to a Linux
compatible scheme or to change the library search to find its
binaries
in a cpio archive (both options should be changeable at build
time to
still use the current linux)?
Regards,
Johannes
[0]: https://github.com/genodelabs/genode/issues/2521
<https://github.com/genodelabs/genode/issues/2521>
[1]:
https://github.com/jklmnn/genode/commit/ef4becffcfc4bfc4079ff411872023b0362f346c
<https://github.com/jklmnn/genode/commit/ef4becffcfc4bfc4079ff411872023b0362f346c>
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