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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-04-14 15:51:10 -0300
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-07-15 09:20:24 -0300
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docs: arm: convert docs to ReST and rename to *.rst
Converts ARM the text files to ReST, preparing them to be an architecture book. The conversion is actually: - add blank lines and identation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Reviewed-by Corentin Labbe <clabbe.montjoie@gmail.com> # For sun4i-ss
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-Kernel initialisation parameters on ARM Linux
----------------------------------------------
-
-The following document describes the kernel initialisation parameter
-structure, otherwise known as 'struct param_struct' which is used
-for most ARM Linux architectures.
-
-This structure is used to pass initialisation parameters from the
-kernel loader to the Linux kernel proper, and may be short lived
-through the kernel initialisation process. As a general rule, it
-should not be referenced outside of arch/arm/kernel/setup.c:setup_arch().
-
-There are a lot of parameters listed in there, and they are described
-below:
-
- page_size
-
- This parameter must be set to the page size of the machine, and
- will be checked by the kernel.
-
- nr_pages
-
- This is the total number of pages of memory in the system. If
- the memory is banked, then this should contain the total number
- of pages in the system.
-
- If the system contains separate VRAM, this value should not
- include this information.
-
- ramdisk_size
-
- This is now obsolete, and should not be used.
-
- flags
-
- Various kernel flags, including:
- bit 0 - 1 = mount root read only
- bit 1 - unused
- bit 2 - 0 = load ramdisk
- bit 3 - 0 = prompt for ramdisk
-
- rootdev
-
- major/minor number pair of device to mount as the root filesystem.
-
- video_num_cols
- video_num_rows
-
- These two together describe the character size of the dummy console,
- or VGA console character size. They should not be used for any other
- purpose.
-
- It's generally a good idea to set these to be either standard VGA, or
- the equivalent character size of your fbcon display. This then allows
- all the bootup messages to be displayed correctly.
-
- video_x
- video_y
-
- This describes the character position of cursor on VGA console, and
- is otherwise unused. (should not be used for other console types, and
- should not be used for other purposes).
-
- memc_control_reg
-
- MEMC chip control register for Acorn Archimedes and Acorn A5000
- based machines. May be used differently by different architectures.
-
- sounddefault
-
- Default sound setting on Acorn machines. May be used differently by
- different architectures.
-
- adfsdrives
-
- Number of ADFS/MFM disks. May be used differently by different
- architectures.
-
- bytes_per_char_h
- bytes_per_char_v
-
- These are now obsolete, and should not be used.
-
- pages_in_bank[4]
-
- Number of pages in each bank of the systems memory (used for RiscPC).
- This is intended to be used on systems where the physical memory
- is non-contiguous from the processors point of view.
-
- pages_in_vram
-
- Number of pages in VRAM (used on Acorn RiscPC). This value may also
- be used by loaders if the size of the video RAM can't be obtained
- from the hardware.
-
- initrd_start
- initrd_size
-
- This describes the kernel virtual start address and size of the
- initial ramdisk.
-
- rd_start
-
- Start address in sectors of the ramdisk image on a floppy disk.
-
- system_rev
-
- system revision number.
-
- system_serial_low
- system_serial_high
-
- system 64-bit serial number
-
- mem_fclk_21285
-
- The speed of the external oscillator to the 21285 (footbridge),
- which control's the speed of the memory bus, timer & serial port.
- Depending upon the speed of the cpu its value can be between
- 0-66 MHz. If no params are passed or a value of zero is passed,
- then a value of 50 Mhz is the default on 21285 architectures.
-
- paths[8][128]
-
- These are now obsolete, and should not be used.
-
- commandline
-
- Kernel command line parameters. Details can be found elsewhere.
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