linux-toradex.git/arch/powerpc/boot/main.c, branch v5.0

powerpc/boot: Fix the early OPAL console wrappers

2016-11-24T06:34:01+00:00

When configured with CONFIG_PPC_EARLY_DEBUG_OPAL=y the kernel expects
the OPAL entry and base addresses to be passed in r8 and r9
respectively. Currently the wrapper does not attempt to restore these
values before entering the decompressed kernel which causes the kernel
to branch into whatever happens to be in r9 when doing a write to the
OPAL console in early boot.

This patch adds a platform_ops hook that can be used to branch into the
new kernel. The OPAL console driver patches this at runtime so that if
the console is used it will be restored just prior to entering the
kernel.

Fixes: 656ad58ef19e ("powerpc/boot: Add OPAL console to epapr wrappers")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Oliver O'Halloran 
Signed-off-by: Michael Ellerman

powerpc/boot: Fix boot on systems with uncompressed kernel image

2016-10-19T09:35:34+00:00

This commit broke boot on systems with an uncompressed kernel image,
namely systems using a cuImage. On such systems the compressed boot
image (boot wrapper, uncompressed kernel image, ..) is decompressed
by u-boot already, therefore the boot wrapper code sees an
uncompressed kernel image.

The old decompression code silently assumed an uncompressed kernel
image if it found no valid gzip signature, whilst the new code
bailed out in this case.

Fix this by re-introducing such a fallback if no valid compressed
image is found.

Fixes: 1b7898ee276b ("Use the pre-boot decompression API")
Signed-off-by: Heiner Kallweit 
Signed-off-by: Michael Ellerman

powerpc/boot: Use the pre-boot decompression API

2016-09-28T04:31:43+00:00

Currently the powerpc boot wrapper has its own wrapper around zlib to
handle decompressing gzipped kernels. The kernel decompressor library
functions now provide a generic interface that can be used in the
pre-boot environment. This allows boot wrappers to easily support
different compression algorithms. This patch converts the wrapper to use
this new API, but does not add support for using new algorithms.

Signed-off-by: Oliver O'Halloran 
Signed-off-by: Michael Ellerman

powerpc/boot: Parse chosen/cmdline-timeout parameter

2014-11-09T22:59:30+00:00

On some platforms a 5 second timeout during boot might be quite long, so
make it configurable. Run the loop at least once to let the user stop
the boot by holding a key pressed. If the timeout is set to 0, don't
wait for input, which can be used as a workaround if the boot hangs on
random data coming in on the serial port.

Signed-off-by: Simon Kagstrom 
[mpe: Changelog wording & whitespace]
Signed-off-by: Michael Ellerman

powerpc: Rename duplicate COMMAND_LINE_SIZE define

2014-04-28T06:31:54+00:00

We have two definitions of COMMAND_LINE_SIZE, one for the kernel
and one for the boot wrapper. I assume this is so the boot
wrapper can be self sufficient and not rely on kernel headers.

Having two defines with the same name is confusing, I just
updated the wrong one when trying to bump it.

Make the boot wrapper define unique by calling it
BOOT_COMMAND_LINE_SIZE.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix format string warning in arch/powerpc/boot/main.c

2008-10-31T09:14:19+00:00

Fix format string warning in arch/powerpc/boot/main.c.  Also correct
a typo ("uncomressed") on the same line.

 BOOTCC  arch/powerpc/boot/main.o
arch/powerpc/boot/main.c: In function 'prep_kernel':
arch/powerpc/boot/main.c:65: warning: format '%08x' expects type
'unsigned int', but argument 3 has type 'long unsigned int'

Signed-off-by: Jon Smirl 
Acked-by: David Gibson 
Signed-off-by: Paul Mackerras

powerpc/boot: Compare _start against ei.loadsize instead ei.memsize

2008-10-21T04:17:47+00:00

If the vmlinux binary in memory is larger than 4 MiB than it collides
with the initial boot code which is linked at 4 MiB in case of cuBoot.
If the the uncompressed image size (on disk size) is less than 4 MiB
then it would fit. The difference between those two sizes is the bss
section. In cuBoot we have the dtb embedded right after the data
section so it is very likely that the reset of the bss section (in
kernel's start up code) will overwrite the dtb blob. Therefore we
reallocate the dtb. Something similar is allready done to the initrd.

Signed-off-by: Sebastian Andrzej Siewior 
Acked-by: David Gibson 
Signed-off-by: Benjamin Herrenschmidt

[POWERPC] Kill flatdevtree.c

2007-12-11T02:46:15+00:00

Now that earlier patches have switched the bootwrapper to using libfdt
for device tree manipulation, this patch removes the now unused
flatdevtree.c and related files.

Signed-off-by: David Gibson 
Signed-off-by: Paul Mackerras

[POWERPC] bootwrapper: Move linker symbols into ops.h

2007-08-22T05:27:28+00:00

Most of these were previously used by numerous C files and
redeclared in each one.

Signed-off-by: Scott Wood 
Signed-off-by: Paul Mackerras

[POWERPC] Make kernel_entry_t have global scope in bootwrapper

2007-06-28T09:16:50+00:00

For the convenience of custom platform code make the powerpc
bootwrapper typdef kernel_entry_t global in scope.

Signed-off-by: Geoff Levand 
Signed-off-by: Paul Mackerras