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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2026-08-19 10:09:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2026-08-19 10:09:22 -0700 |
| commit | f4cdf7ca9a1fdcca413157df19753f388a5a224e (patch) | |
| tree | 60a31895b2446cd7fa27514e8c2843534a0de0da /Documentation/arch/arm/setup.rst | |
| download | linux-stable-f4cdf7ca9a1fdcca413157df19753f388a5a224e.tar.gz linux-stable-f4cdf7ca9a1fdcca413157df19753f388a5a224e.zip | |
Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediagrafted
Pull media updates from Mauro Carvalho Chehab:
- v4l2-core: added ISP statistics support and per-block validation
- v4l2-core: Allow unknown HDR10 white point and luminance
- New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor
- New codec: Milos: VPU v2.0 codec support
- isp driver: gained support for Dreamchip RPPX1 ISP framework
- vsp1 driver: gained support for RZ/T2H and RZ/N2H
- Novalake driver: gained CVS support for new NVL hardware
- dvb-core: fix feed leak on failed DMX_ADD_PID
- several driver fixes, cleanups and minor improvements
* tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits)
media: ipu-bridge: check all DMI entries when overriding sensor rotation
media: v4l2-async: avoid deleting unlinked ASC entry on link error
media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement
media: intel/ipu6: fix async notifier cleanup leak on parse error
media: staging/ipu7: fix async notifier UAF on probe error path
media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
media: rcar-isp: Fix VSPX reference leaks
media: rcar-isp: Release ISPCORE resources
media: i2c: imx415: Release runtime PM reference on VBLANK error
media: i2c: imx415: Return test pattern write errors
media: renesas: vsp1: Declare index variables in for loop statement
media: renesas: vsp1: Make reset control optional to support platforms without a reset line
media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs
media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs
media: nxp: imx8-isi: Add additional 32-bit RGB format support
media: nxp: imx8-isi: Add 16-bit raw Bayer format support
media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams
media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks
media: nxp: imx8-isi: Correct color map between V4L2 and ISI
...
Diffstat (limited to 'Documentation/arch/arm/setup.rst')
| -rw-r--r-- | Documentation/arch/arm/setup.rst | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/Documentation/arch/arm/setup.rst b/Documentation/arch/arm/setup.rst new file mode 100644 index 000000000..8e12ef3fb --- /dev/null +++ b/Documentation/arch/arm/setup.rst @@ -0,0 +1,108 @@ +============================================= +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. |
