Commit Graph

24 Commits

Author SHA1 Message Date
Feng Tang 4d033556f1 x86, earlyprintk: Add hsu early console for Intel Medfield platform
Intel Medfield platform has a high speed UART device, which
could act as a early console. To enable early printk of HSU
console, simply add "earlyprintk=hsu" in kernel command line.

Currently we put the code in the early_printk_mrst.c as it is
also for Intel MID platforms like the mrst early console

Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Cc: greg@kroah.com
LKML-Reference: <1284361736-23011-5-git-send-email-feng.tang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-10-08 10:01:47 +02:00
Feng Tang c20b5c3318 x86, earlyprintk: Add earlyprintk for Intel Moorestown platform
Intel Moorestown platform has a spi-uart device(Maxim3110),
which connects to a Designware spi core controller. This patch
will add early console function based on it.

As it will be used long before Linux spi subsystem get
initialised, we simply directly manipulate the spi controller's
register to acheive the early console func. This is safe as it
will be disabled when devices subsytem get initialised.

To use it, user need enable CONFIG_X86_MRST_EARLY_PRINTK in
kenrel config and add "earlyprintk=mrst" in kernel command line.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Cc: greg@kroah.com
LKML-Reference: <1284361736-23011-4-git-send-email-feng.tang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-10-08 10:01:47 +02:00
Jason Wessel 61eaf539b9 earlyprintk,vga,kdb: Fix \b and \r for earlyprintk=vga with kdb
Allow kdb to work properly with with earlyprintk=vga by interpreting
the backspace and carriage return output characters.  These
interpretation of these characters is used for simple line editing
provided in the kdb shell.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
CC: x86@kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2010-05-20 21:04:31 -05:00
Jason Wessel ea3acb199a x86: earlyprintk: Fix regression to handle serial,ttySn as 1 arg
Commit c953094 ("early_printk: Allow more than one early console")
introduced a regression in the parsing of the earlyprintk= kernel
arguments.

If you specify "earlyprintk=serial,ttyS0,115200" as a kernel
argument, the "serial,ttyS" should be parsed as a single argument
and not as "serial" and then "ttyS".

Also update the documentation to reflect you can specify the ttyS
directly without the "serial" argument.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <gregkh@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
LKML-Reference: <4ABB7D5E.6000301@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-01 10:34:16 +02:00
Jason Wessel 429a6e5e2c x86: early_printk: Protect against using the same device twice
If you use the kernel argument:

  earlyprintk=serial,ttyS0,115200

This will cause a recursive hang printing the same line
again and again:

 BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
bootconsole [earlyser0] enabled
Linux version 2.6.31-07863-gb64ada6 (mingo@sirius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #16789 SMP Wed Sep 23 21:09:43 CEST 2009
Linux version 2.6.31-07863-gb64ada6 (mingo@sirius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #16789 SMP Wed Sep 23 21:09:43 CEST 2009
Linux version 2.6.31-07863-gb64ada6 (mingo@sirius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #16789 SMP Wed Sep 23 21:09:43 CEST 2009
Linux version 2.6.31-07863-gb64ada6 (mingo@sirius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #16789 SMP Wed Sep 23 21:09:43 CEST 2009
Linux version 2.6.31-07863-gb64ada6 (mingo@sirius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #16789 SMP Wed Sep 23 21:09:43 CEST 2009

Instead warn the end user that they specified the device
a second time, and ignore that second console.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <gregkh@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <4ABAAB89.1080407@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-24 13:01:13 +02:00
Jason Wessel c9530948bc early_printk: Allow more than one early console
It is desirable to be able to use one early boot device to debug
another or to have multiple places you can see the early boot
diagnostics, such as the vga screen or serial device.

This patch changes the early_printk console device registration to
allow more than one early printk device to get registered via
register_console().

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-09-23 06:46:38 -07:00
Jason Wessel df6c516900 USB: ehci,dbgp,early_printk: split ehci debug driver from early_printk.c
Move the dbgp early printk driver in advance of refactoring and adding
new code, so the changes to this code are tracked separately from the
move of the code.

The drivers/usb/early directory will be the location of the current
and future early usb code for driving usb devices prior initializing
the standard interrupt driven USB drivers.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-09-23 06:46:38 -07:00
Jan Beulich 414128bd33 x86: Increase timeout for EHCI debug port reset completion in early printk
On one of my systems, several thousand iterations are needed before
CMD_RESET can be observed clear after setting it. Using a much
higher value here obviously cannot hurt.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
LKML-Reference: <4AA0E85D02000078000136F9@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-20 20:23:37 +02:00
Jan Beulich 9a50156a1c x86: properly __init-annotate recent early_printk additions
Impact: cleanup, save memory

Don't keep code resident that's only needed during startup.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <49B91103.76E4.0078.0@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-13 02:37:18 +01:00
Ingo Molnar 726c0d95b6 x86: early_printk.c - fix pgtable.h unification fallout
arch/x86/kernel/early_printk.c: In function ‘early_dbgp_init’:
 arch/x86/kernel/early_printk.c:827: error: ‘PAGE_KERNEL_NOCACHE’ undeclared (first use in this function)
 arch/x86/kernel/early_printk.c:827: error: (Each undeclared identifier is reported only once
 arch/x86/kernel/early_printk.c:827: error: for each function it appears in.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-09 11:32:17 +01:00
Jeremy Fitzhardinge fb08b20fe7 x86: Fix compile error in arch/x86/kernel/early_printk.c
Fix compile problem:

  CC      arch/x86/kernel/early_printk.o
In file included from /home/jeremy/hg/xen/paravirt/linux/arch/x86/kernel/early_printk.c:17:
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h: In function 'pmd_page':
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:516: error: implicit declaration of function '__pfn_to_section'
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:516: warning: initialization makes pointer from integer without a cast
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:516: error: implicit declaration of function '__section_mem_map_addr'
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:516: warning: return makes pointer from integer without a cast
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h: In function 'pud_page':
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:586: warning: initialization makes pointer from integer without a cast
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:586: warning: return makes pointer from integer without a cast
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h: In function 'pgd_page':
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:625: warning: initialization makes pointer from integer without a cast
/home/jeremy/hg/xen/paravirt/linux/arch/x86/include/asm/pgtable.h:625: warning: return makes pointer from integer without a cast

This is a cycling dependency between asm/pgtable.h and linux/mmzone.h
when using CONFIG_SPARSEMEM.  Rather than hacking up the headers some
more, remove asm/pgtable.h, since early_printk.c doesn't actually need
it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2009-02-06 14:05:42 -08:00
Cyrill Gorcunov c64d8996bd x86: early_printk - use sizeof instead of hardcoded number
Impact: cleanup

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-02 10:27:46 +01:00
Andi Kleen fd28a5b58d x86: remove simnow earlyprintk support
Impact: remove obsolete code

The later versions of SimNow! actually all have serial console
emulation, so the direct interface isn't needed anymore. So remove
the undocumented simnow earlyprintk console.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-12-12 17:02:21 +01:00
Ingo Molnar 45e96f26f2 warnings: fix arch/x86/kernel/early_printk.c
fix warning:

  arch/x86/kernel/early_printk.c:993: warning: ‘enable_debug_console’ defined but not used

Eliminate dead code.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-12 15:19:36 +02:00
Jan Beulich 30cec97967 x86: init annotations in early_printk() setup
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-06 19:41:31 +02:00
Harvey Harrison 467cd0529a x86: early_printk.c trivial sparse fixes
arch/x86/kernel/early_printk.c:404:13: warning: incorrect type in assignment (different base types)
arch/x86/kernel/early_printk.c:404:13:    expected restricted __le16 [assigned] [usertype] wValue
arch/x86/kernel/early_printk.c:404:13:    got int [signed] value
arch/x86/kernel/early_printk.c:405:13: warning: incorrect type in assignment (different base types)
arch/x86/kernel/early_printk.c:405:13:    expected restricted __le16 [assigned] [usertype] wIndex
arch/x86/kernel/early_printk.c:405:13:    got int [signed] index
arch/x86/kernel/early_printk.c:406:14: warning: incorrect type in assignment (different base types)
arch/x86/kernel/early_printk.c:406:14:    expected restricted __le16 [assigned] [usertype] wLength
arch/x86/kernel/early_printk.c:406:14:    got int [signed] size
arch/x86/kernel/early_printk.c:845:16: warning: Using plain integer as NULL pointer
arch/x86/kernel/early_printk.c:992:13: warning: symbol 'enable_debug_console' was not declared. Should it be static?

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-08-19 02:14:29 +02:00
Yinghai Lu 5c05917e7f x86: usb debug port early console, v4
based on work from Eric, and add some timeout so don't dead loop when debug
device is not installed

v2: fix checkpatch warning
v3: move ehci struct def to linux/usrb/ehci_def.h from host/ehci.h
    also add CONFIG_EARLY_PRINTK_DBGP to disable it by default
v4: address comments from Ingo, seperate ehci reg def moving to another patch
    also add auto detect port that connect to debug device for Nvidia
    southbridge

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: "Arjan van de Ven" <arjan@infradead.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Greg KH" <greg@kroah.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-26 16:18:41 +02:00
Jiri Slaby e17ba73b0e x86, generic: mark early_printk as asmlinkage
It's not explicitly marked as asmlinkage, but invoked from x86_32
startup code with parameters on stack.

No other architectures define early_printk and none of them are affected
by this change, since defines asmlinkage as empty token.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-06-18 13:11:01 +02:00
Paolo Ciarrocchi c9cf39ae64 x86: coding style fixes to x86/kernel/early_printk.c
Depends on:
[PATCH 2/3] x86: coding style fixes to arch/x86/kernel/early_printk.c

Remove two:
ERROR: do not initialise statics to 0 or NULL

paolo@paolo-desktop:/tmp/c$ size *
   text    data     bss     dec     hex filename
   1172     280      12    1464     5b8 early_printk.o.after
   1172     280      12    1464     5b8 early_printk.o.before

This patch is changing the binary output:

paolo@paolo-desktop:/tmp/c$ md5sum *
dad9a9a881e0eeda62cc5645bd3d7cad  early_printk.o.after
da32f5cd8f248970e4809e1005393e95  early_printk.o.before

because the two variables moved to another section. No
change in functionality.

Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17 17:40:51 +02:00
Paolo Ciarrocchi e941f27a7a x86: coding style fixes to arch/x86/kernel/early_printk.c
Before:
total: 17 errors, 3 warnings, 254 lines checked

After:
total: 2 errors, 3 warnings, 254 lines checked

paolo@paolo-desktop:/tmp/b$ md5sum *
da32f5cd8f248970e4809e1005393e95  early_printk.o.after
da32f5cd8f248970e4809e1005393e95  early_printk.o.before

paolo@paolo-desktop:/tmp/b$ size *
   text    data     bss     dec     hex filename
   1172     280      12    1464     5b8 early_printk.o.after
   1172     280      12    1464     5b8 early_printk.o.befor

Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17 17:40:51 +02:00
Harvey Harrison bb0e129087 x86: make early_console static in early_printk.c
Not necessary to expose it, also fixes sparse warning.

arch/x86/kernel/early_printk.c:196:16: warning: symbol 'early_console' was not declared. Should it be static?

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-02-01 17:49:42 +01:00
H. Peter Anvin 30c826451d [x86] remove uses of magic macros for boot_params access
Instead of using magic macros for boot_params access, simply use the
boot_params structure.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2007-10-16 17:38:31 -07:00
Thomas Gleixner 250c22777f x86_64: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-11 11:17:24 +02:00
Thomas Gleixner 9a163ed8e0 i386: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-11 11:17:01 +02:00