lwn.git/arch/powerpc/boot/ops.h, branch standardize-docs

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: 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: Add OPAL console to epapr wrappers

2016-07-05T13:58:54+00:00

This patch adds an OPAL console backend to the powerpc boot wrapper so that decompression failures inside the wrapper can be reported to the user. This is important since it typically indicates data corruption in the firmware and other nasty things. Currently this only works when building a little endian kernel. When compiling a 64 bit BE kernel the wrapper is always build 32 bit to be compatible with some 32 bit firmwares. BE support will be added at a later date. Another limitation of this is that only the "raw" type of OPAL console is supported, however machines that provide a hvsi console also provide a raw console so this is not an issue in practice. Actually-written-by: Benjamin Herrenschmidt Signed-off-by: Oliver O'Halloran [mpe: Move #ifdef __powerpc64__ to avoid warnings on 32-bit] 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: Bump BOOT_COMMAND_LINE_SIZE to 2048

2014-04-28T06:32:02+00:00

Bump the boot wrapper BOOT_COMMAND_LINE_SIZE to match the kernel. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

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: Add del_node() for early boot code to prune inapplicable devices.

2008-10-22T04:01:21+00:00

Some platforms have variants that can share most of a flat device tree but need a few devices selectively pruned at boot time. This adds del_node() to ops.h to allow access to the existing fdt_del_node(). Signed-off-by: Mike Ditto Signed-off-by: Benjamin Herrenschmidt

[POWERPC] Add bootwrapper function to get virtual reg from the device tree.

2008-04-17T06:01:37+00:00

This patch adds a new generic device tree processing function that retrieves virtual reg addresses from the device tree to the bootwrapper code. It also updates the bootwrapper code to use the new function. dt_get_virtual_reg() retrieves the virtual reg addresses from the "virtual-reg" property. If the property can't be found, it uses the "reg" property and walks the tree to translate it to absolute addresses. Signed-off-by: Laurent Pinchart Acked-by: Scott Wood Signed-off-by: Kumar Gala

[POWERPC] bootwrapper: Add find_node_by_compatible

2008-01-27T20:07:37+00:00

Add the ability to find a device node by just what its compatible with. This is useful in cases that we don't have a prop to find the node with. Signed-off-by: Kumar Gala

[POWERPC] bootwrapper: Add find_node_by_alias and dt_fixup_mac_address_by_alias

2008-01-24T01:32:44+00:00

Add the ability to set the mac address given the alias for the device. Removes the need for having a linux,network-index property. Signed-off-by: Kumar Gala