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/Documentation/arch/arm/
Dsetup.rst18 This parameter must be set to the page size of the machine, and
46 These two together describe the character size of the dummy console,
47 or VGA console character size. They should not be used for any other
51 the equivalent character size of your fbcon display. This then allows
55 This describes the character position of cursor on VGA console, and
56 is otherwise unused. (should not be used for other console types, and
77 is non-contiguous from the processors point of view.
81 be used by loaders if the size of the video RAM can't be obtained
85 This describes the kernel virtual start address and size of the
95 system 64-bit serial number
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Dbooting.rst9 The following documentation is relevant to 2.4.18-rmk6 and beyond.
28 ---------------------------
38 to automatically locate and size all RAM, or it may use knowledge of
44 -----------------------------
53 which serial port it should use for the kernel console (generally
56 As an alternative, the boot loader can pass the relevant 'console='
60 Documentation/admin-guide/kernel-parameters.rst.
64 --------------------------
69 MANDATORY except for DT-only platforms
75 value to the kernel. (see linux/arch/arm/tools/mach-types). This
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/Documentation/devicetree/bindings/reserved-memory/
Dramoops.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/reserved-memory/ramoops.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 recovered after a reboot. This is a child-node of "/reserved-memory", and
16 as kernel log messages, or for optional ECC error-correction data. The total
17 size of these optional buffers must fit in the reserved region.
20 records. These records have a configurable size, with a size of 0 indicating
23 At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size"
24 must be set non-zero, but are otherwise optional as listed below.
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/Documentation/scsi/
Dadvansys.rst1 .. SPDX-License-Identifier: GPL-2.0
8 RISC-based, Bus-Mastering, Fast (10 Mhz) and Ultra (20 Mhz) Narrow
9 (8-bit transfer) SCSI Host Adapters for the ISA, EISA, VL, and PCI
10 buses and RISC-based, Bus-Mastering, Ultra (20 Mhz) Wide (16-bit
18 lowered in the BIOS by changing the 'Host Queue Size' adapter setting.
21 - ABP-480 - Bus-Master CardBus (16 CDB)
24 - ABP510/5150 - Bus-Master ISA (240 CDB)
25 - ABP5140 - Bus-Master ISA PnP (16 CDB)
26 - ABP5142 - Bus-Master ISA PnP with floppy (16 CDB)
27 - ABP902/3902 - Bus-Master PCI (16 CDB)
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/Documentation/ABI/testing/
Dpstore12 of the console log is captured, but other interesting
15 # mount -t pstore -o kmsg_bytes=8000 - /sys/fs/pstore
17 $ ls -l /sys/fs/pstore/
19 -r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1
24 - "dmesg" - saved console log
25 - "mce" - architecture dependent data from fatal h/w error
29 device that it can reclaim the space for later re-use::
31 $ rm /sys/fs/pstore/dmesg-erst-1
40 multiple) files based on the record size of the underlying
/Documentation/arch/x86/
Dearlyprintk.rst1 .. SPDX-License-Identifier: GPL-2.0
7 Mini-HOWTO for using the earlyprintk=dbgp boot option with a
13 [host/target] <-------> [USB debug key] <-------> [client/console]
21 the lspci -vvv output::
23 # lspci -vvv
25 …roller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])
27 …Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisIN…
28 …Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- I…
31 Region 0: Memory at fe227000 (32-bit, non-prefetchable) [size=1K]
33 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
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/Documentation/arch/s390/
D3270.rst17 Linux/390. A 3270 device is a block-mode rows-and-columns terminal of
21 You may have 3270s in-house and not know it. If you're using the
22 VM-ESA operating system, define a 3270 to your virtual machine by using
23 the command "DEF GRAF <hex-address>" This paper presumes you will be
26 - DEF GRAF 620
27 - DEF GRAF 621
28 - DEF GRAF 622
29 - DEF GRAF 623
31 Your network connection from VM-ESA allows you to use x3270, tn3270, or
34 and this Linux-390 3270 driver, you have another way of talking to your
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/Documentation/admin-guide/
Dpstore-blk.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ------------
10 block device and non-block device before the system crashes. You can get
13 mount -t pstore pstore /sys/fs/pstore
17 ---------------------
27 Configurations for driver are all about block device and non-block device,
31 -----------------------
51 #. /dev/<disk_name><decimal> represents the device number of partition - device
53 #. /dev/<disk_name>p<decimal> - same as the above; this form is used when disk
60 #. PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF represents the unique id of
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Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
25 default _serial_ console on ARM64
41 If set to vendor, prefer vendor-specific driver
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Dvga-softcursor.rst8 you can set the size of hardware cursor. You can now play a few new
9 tricks: you can make your cursor look like a non-blinking red block,
20 specifies cursor size::
39 color codes used by the console) and the most significant one turns
40 on highlight (or sometimes blinking -- it depends on the configuration
50 --------
54 echo -e '\033[?2c'
58 echo -e '\033[?6c'
60 To get red non-blinking block, use::
62 echo -e '\033[?17;0;64c'
Dinitrd.rst15 where the kernel comes up with a minimum set of compiled-in drivers, and
23 ---------
51 Boot command-line options
52 -------------------------
70 Note: /dev/initrd is read-only and it can only be used once. As soon
80 ----------------------
88 find . | cpio --quiet -H newc -o | gzip -9 -n > /boot/imagefile.img
94 gzip -cd /boot/imagefile.img | cpio -imd --quiet
97 ------------
127 - a floppy disk (works everywhere but it's painfully slow)
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Dkernel-parameters.rst3 The kernel's command-line parameters
12 The kernel parses parameters from the kernel command line up to "``--``";
16 Everything after "``--``" is passed as an argument to init.
32 log_buf_len=1M print-fatal-signals=1
36 log-buf-len=1M print_fatal_signals=1
38 Double-quotes can be used to protect spaces in values, e.g.::
43 ----------
52 <cpu number>-<cpu number>
57 <cpu number>,...,<cpu number>-<cpu number>
63 <cpu number>-<cpu number>:<used size>/<group size>
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/Documentation/trace/
Dstm.rst1 .. SPDX-License-Identifier: GPL-2.0
34 associated with it, located in "stp-policy" subsystem directory in
40 $ ls /config/stp-policy/dummy_stm.my-policy/user
42 $ cat /config/stp-policy/dummy_stm.my-policy/user/masters
44 $ cat /config/stp-policy/dummy_stm.my-policy/user/channels
70 catch-all entry "default" will be used, if it exists. This entry also
81 and have better control over the un-identified sources.
84 to userspace for zero-copy writing. One mappable page (in terms of
88 stm device's channel mmio region is 64 bytes and hardware page size is
99 For kernel-based trace sources, there is "stm_source" device
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Ddebugging.rst11 - Written for: 6.12
14 ------------
21 $ sudo mount -t tracefs tracefs /sys/kernel/tracing
25 --------------------
57 ------------------------
68 buffer when a oops occurs to the console. This can be useful if the console
69 is being logged somewhere. If a serial console is used, it may be prudent to
77 buffers is broken up into sub-buffers that are by default PAGE_SIZE. The
82 -------------------------------
102 each per CPU ring buffer will be 1.5 megabytes in size. Note, that also
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/Documentation/dev-tools/
Dkgdb.rst15 Kdb is simplistic shell-style interface which you can use on a system
16 console with a keyboard or serial console. You can use it to inspect
22 kernel built-ins or in kernel modules if the code was built with
40 kgdb I/O modules compiled as built-ins or loadable kernel modules in the
46 - In order to enable compilation of kdb, you must first enable kgdb.
48 - The kgdb test compile options are described in the kgdb test suite
52 ------------------------------
55 :menuselection:`Kernel hacking --> Kernel debugging` and select
73 certain regions of the kernel's memory space as read-only. If kgdb
93 -----------------------------
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/Documentation/fb/
Dsisfb.rst8 - SiS 300 series: SiS 300/305, 540, 630(S), 730(S)
9 - SiS 315 series: SiS 315/H/PRO, 55x, (M)65x, 740, (M)661(F/M)X, (M)741(GX)
10 - SiS 330 series: SiS 330 ("Xabre"), (M)760
16 sisfb is eg. useful if you want a high-resolution text console. Besides that,
28 a graphical console, you don't need sisfb on kernels >=2.6.3.
59 Additionally: If you give more than one argument to the in-kernel sisfb, the
77 - XxYxDepth or
78 - XxY-Depth or
79 - XxY-Depth@Rate or
80 - XxY
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Dgxfb.rst13 * It provides a nice large console (128 cols + 48 lines with 1024x768)
16 * Most important: boot logo :-)
36 XF68_FBDev should generally work fine, but it is non-accelerated.
48 <x>x<y>[-<bpp>][@<refresh>]
49 vram size of video ram (normally auto-detected)
Dlxfb.rst14 * It provides a nice large console (128 cols + 48 lines with 1024x768)
17 * Most important: boot logo :-)
37 XF68_FBDev should generally work fine, but it is non-accelerated.
49 <x>x<y>[-<bpp>][@<refresh>]
50 vram size of video ram (normally auto-detected)
Dviafb.rst2 VIA Integration Graphic Chip Console Framebuffer Driver
6 --------
7 The console framebuffer driver is for graphics chips of
15 ---------------
34 ----------------------
47 - 640x480 (default)
48 - 720x480
49 - 800x600
50 - 1024x768
53 - 8, 16, 32 (default:32)
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Dcirrusfb.rst12 - SD64
13 - Piccolo
14 - Picasso
15 - Spectrum
16 - Alpine (GD-543x/4x)
17 - Picasso4 (GD-5446)
18 - GD-5480
19 - Laguna (GD-546x)
22 - PCI
23 - Zorro
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/Documentation/devicetree/bindings/soc/aspeed/
Duart-routing.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
5 ---
6 $id: http://devicetree.org/schemas/soc/aspeed/uart-routing.yaml#
7 $schema: http://devicetree.org/meta-schemas/core.yaml#
12 - Oskar Senft <osk@google.com>
13 - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
17 the built-in UARTS and physical serial I/O ports.
20 This can be used to enable Host <-> BMC communication via UARTs, e.g. to
21 allow access to the Host's serial console.
30 - enum:
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/Documentation/networking/
Dnetconsole.rst1 .. SPDX-License-Identifier: GPL-2.0
14 Extended console support by Tejun Heo <tj@kernel.org>, May 1 2015
29 It can be used either built-in or as a module. As a built-in,
41 netconsole=[+][r][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
44 + if present, enable extended console support
46 src-port source for UDP packets (defaults to 6665)
47 src-ip source IP to use (interface address)
49 tgt-port port for logging agent (6666)
50 tgt-ip IP address for logging agent
51 tgt-macaddr ethernet MAC address for logging agent (broadcast)
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/Documentation/networking/device_drivers/ethernet/intel/
Didpf.rst1 .. SPDX-License-Identifier: GPL-2.0+
33 -------
42 ---------------------
43 Link messages will not be displayed to the console if the distribution is
45 your console, set dmesg to eight by entering the following::
47 # dmesg -n 8
54 ------------
58 Use the ip command to increase the MTU size. For example, enter the following
66 maximum jumbo frame size of 9728 bytes.
87 -----------------------
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/Documentation/devicetree/bindings/serial/
Damlogic,meson-uart.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Neil Armstrong <neil.armstrong@linaro.org>
15 of SoCs, and can be present either in the "Always-On" power domain or the
16 "Everything-Else" power domain.
18 The particularity of the "Always-On" Serial Interface is that the hardware
19 is active since power-on and does not need any clock gating and is usable
20 as very early serial console.
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/Documentation/translations/zh_TW/arch/arm/
DBooting11 ---------------------------------------------------------------------
24 ---------------------------------------------------------------------
32 以下文檔適用於 2.4.18-rmk6 及以上版本。
48 -------------------
60 -----------------------------
68 作爲替代方案，引導加載程序也可以通過標籤列表傳遞相關的'console='
71 Documentation/admin-guide/kernel-parameters.rst。
75 --------------------------
83 (詳見 linux/arch/arm/tools/mach-types )。
86 ------------------
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