Re: New Debian sparc64 test kernel for stack corruption issue
I think the problem was that the generated kernel image is compressed which is why it
won't work with GRUB unless to decompress it first on the target machine.
Huh, you're right!
At first glance, I thought there was a build option for this.
And there is, in fact, but it gets autoremoved if you try to set it on sparc64.
This thread[1] hints that setting HAVE_KERNEL_UNCOMPRESSED helps, so I added "select HAVE_KERNEL_UNCOMPRESSED=y" to arch/sparc/Kconfig helped, but this didn't work.
I still ended up with a gzip-compressed /boot/vmlinuz. :(
But no worries, decompressing it manually isn't a big deal.
apt install gcc-sparc64-linux-gnu libdw-dev:native libssl-dev:sparc64
What's libssl-dev needed for?
I have no idea... the build process seems to use some Debian functionality, and it complains if the package isn't installed.
Oh, and I forgot... you still need to force cross-compilation, but you can use the Debian compiler instead:
export CROSS_COMPILE=sparc64-linux-gnu-
export ARCH=sparc
And I can confirm that the resulting kernel boots fine.
However... I can't seem to get KGDB to work. :(
This kernel has it enabled:
grep KGDB .config
CONFIG_HAVE_ARCH_KGDB=y
CONFIG_KGDB=y
CONFIG_KGDB_HONOUR_BLOCKLIST=y
CONFIG_KGDB_SERIAL_CONSOLE=y
# CONFIG_KGDB_TESTS is not set
CONFIG_KGDB_KDB=y
But when I try to configure it, I get:
echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc
bash: echo: write error: No such device
Configuring through the kernel command line doesn't work either.
The only KGDB-related message I see in dmesg is:
platform kgdboc: deferred probe pending: (reason unknown)
Any ideas?
[1] https://forums.gentoo.org/viewtopic-p-8773246.html
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