gmane.linux.kernel.embedded

RE: [systemd-devel] 2013 Plumber's CFP: Fastboot

Mehaffey, John — 2013-05-16T15:03:44

Hi Lennart,
I have merged the topics from the fastboot proposal to the Boot and Core OS proposal.

Please take a look and make any improvements.

I am keeping the fastboot proposal on the wiki as reference material for now, but I have linked it to the Boot and Core OS page.

-mehaf

Re: [systemd-devel] 2013 Plumber's CFP: Fastboot

Lennart Poettering — 2013-05-16T12:33:01


Let's merge this then (the LPC guys want this to).

We could copy the stuff from the fastboot MC wiki page into the
boot/core OS wiki page, or the other way round. And preference? I'd
still call this "Boot and Core OS MC" as this has the slightler broader
topic, I guess...

Lennart

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Re: How to use DEBUG macros in compressed/head.S

Rob Landley — 2013-01-16T17:05:33

No, that's just the last thing it output.

I seldom find other people's debug code useful. I stick a printf()  
variant in the code at a place I want to see what it's doing, and then  
I know what the output means. I only enable their debug code if I'm  
sending the output to the person who wrote said debug code. (There are  
exceptions, but they're exceptions to a useful rule of thumb.)

At this level, you can do direct writes to the serial chip ala:

    
http://balau82.wordpress.com/2010/02/28/hello-world-for-bare-metal-arm-using-qemu/

Note that's for qemu, which pauses when it gets a port write. For real  
hardware you need to check the status bit before sending the next  
character, basically spinning on a port read until the relevant bit  
gets set/cleared to indicate the hardware's done with the last thing  
you sent it. I don't remember the check off the top of my head (last  
time I needed it I dug it out of the uboot source), but if you're just  
debugging you can do a delay loop between each wri

Re: How to use DEBUG macros in compressed/head.S

Baurzhan Ismagulov — 2013-01-16T10:30:34

Hello zhaoyilong,

I do get your mails.

On Wed, Jan 16, 2013 at 04:17:39PM +0800, zhaoyilong wrote:
...
...
...
...

What do you mean by "branch"? Those are macro definitions that are
expanded inline by the assembler.



So you have a vendor kernel that works on your board? That is good.



We don't have your vendor's kernel, so no one except your vendor can
tell. Possibly DEBUG support for head.S is broken in that tree.



What do you mean by "disappeared"? Do I understand correctly, the vendor
kernel didn't build with DEBUG enabled, and still doesn't? And the
mainline kernel does build? If so, the vendor kernel is broken w.r.t.
DEBUG in head.S.



Often it's an exception somewhere. It may be an exception in kputc. So
it's important to know whether kputc works in a working kernel, which
you can't test since the vendor kernel doesn't build with DEBUG in
head.S.



Since it's called from the assembly code, I'd assume it's a macro. Grep
for it in the mainline kernel and see whether it exists at the same
locat

How to use DEBUG macros in compressed/head.S

zhaoyilong — 2013-01-16T08:17:39

When I open the macro DEBUG in the front of  file
arch/arm/boot/decompressed/head.S,the kernel runs and stops at"Uncompressing
Linux... done, booting the kernel."
CONFIG_DEBUG_ICEDCC is closed by default, so I am sure  the code runs tothe
following branch:
...........
...........
...........
.macro kputc,val
mov r0, \val
bl putc
.endm

.macro kphex,val,len
mov r0, \val
mov r1, #\len
bl phex
.endm

.macro debug_reloc_start
#ifdef DEBUG
kputc #'\n'
kphex r6, 8 /* processor id */
kputc #':'
kphex r7, 8 /* architecture id */
...........
...........
...........

Problem is happened in a context like this:

    I have a board use cpu S5PV210,and an ok kernel provide by the factory
anda  kernel download from kernel.org which carshed after printing "starting
kernel..." to dnw.
    To debug this,I want to test the macro kputc provided in this file
using ok kernel.
I add a line "kputc #'a' " after the tag ".text", then make error says
"undefined reference to `putc' ",it seems that compiler cant find "putc"
used in

Re: I can only receive email from lkml,why?

Vladimir Murzin — 2013-01-16T07:45:28

HI!

Have you checked settings for your spam filter?

Best wishes
Vladimir
--

-----Original Message-----
From:"zhaoyilong" <registcn< at >gmail.com>
Sender:linux-embedded-owner< at >vger.kernel.org
Date:Wed, 16 Jan 2013 15:05:18 
To: linux- embedded<linux-embedded< at >vger.kernel.org>; Steven J. Hill<sjhill< at >realitydiluted.com>
Subject: Re: I can only receive email from lkml,why?

sorry,but I mean all the lists from majordomo.
Since you can see a email semd to someone(not you) and copy to 
linux-embeded,is that mean I am successed in joining to this list?

But nobody answer my first question emailed.Is it because my question too 
easy? nobody answer easy question ,is this a normal phenomenon?
----- Original Message ----- 
From: "Steven J. Hill" <sjhill< at >realitydiluted.com>
To: "zhaoyilong" <registcn< at >gmail.com>
Cc: <chuansheng.liu< at >intel.com>; "linux- embedded" 
<linux-embedded< at >vger.kernel.org>
Sent: Tuesday, January 15, 2013 11:19 PM
Subject: Re: I can only receive email from lkml,why?

Re: I can only receive email from lkml,why?

zhaoyilong — 2013-01-16T07:05:18

sorry,but I mean all the lists from majordomo.
Since you can see a email semd to someone(not you) and copy to 
linux-embeded,is that mean I am successed in joining to this list?

But nobody answer my first question emailed.Is it because my question too 
easy? nobody answer easy question ,is this a normal phenomenon?
----- Original Message ----- 
From: "Steven J. Hill" <sjhill< at >realitydiluted.com>
To: "zhaoyilong" <registcn< at >gmail.com>
Cc: <chuansheng.liu< at >intel.com>; "linux- embedded" 
<linux-embedded< at >vger.kernel.org>
Sent: Tuesday, January 15, 2013 11:19 PM
Subject: Re: I can only receive email from lkml,why?

Re: I can only receive email from lkml,why?

Steven J. Hill — 2013-01-15T15:19:01

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 01/15/2013 12:51 AM, zhaoyilong wrote:
Because this is the 'linux-embedded' mailing list?

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Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iEYEARECAAYFAlD1c2UACgkQgyK5H2Ic36dGbQCdFQDjebWU09dOE58CdVjdP9ri
WDEAn158GtamdlM2eSfqF5tcsPzm4MMj
=Epva
-----END PGP SIGNATURE-----

I can only receive email from lkml,why?

zhaoyilong — 2013-01-15T06:51:05

Are you chinese?

Sorry to disturb you for a simple question.

I have set text coded with utf-8 and use plain text rather than html.

But why cant I receive email from lkml?
thx!

[head.S]open DEBUG in compressed/head.S, kernel crashed...

zhaoyilong — 2013-01-14T01:32:57

When I open the macro DEBUG in the front of  file
arch/arm/boot/decompressed/head.S,the kernel runs and stops at"Uncompressing
Linux... done, booting the kernel."
CONFIG_DEBUG_ICEDCC is closed by default, so I am sure  the code runs tothe
following branch:
...........
...........
...........
.macro kputc,val
mov r0, \val
bl putc
.endm

.macro kphex,val,len
mov r0, \val
mov r1, #\len
bl phex
.endm

.macro debug_reloc_start
#ifdef DEBUG
kputc #'\n'
kphex r6, 8 /* processor id */
kputc #':'
kphex r7, 8 /* architecture id */
...........
...........
...........

Problem is happened in a context like this:

    I have a board use cpu S5PV210,and an ok kernel provide by the factory
anda  kernel download from kernel.org which carshed after printing "starting
kernel..." to dnw.
    To debug this,I want to test the macro kputc provided in this file¡ª¡ª
using ok kernel.
I add a line "kputc #'a' " after the tag ".text", then make error says
"undefined reference to `putc' ",it seems that compiler cant find "putc"
use

opening DEBUG in compressed/head.S, kernel crashed

zhaoyilong — 2013-01-13T12:38:39

 When I open the macro DEBUG in the front of  file
arch/arm/boot/decompressed/head.S,the kernel runs and stops at"Uncompressing
Linux... done, booting the kernel."
CONFIG_DEBUG_ICEDCC is closed by default, so I am sure  the code runs tothe
following branch:
...........
...........
...........
.macro kputc,val
mov r0, \val
bl putc
.endm

.macro kphex,val,len
mov r0, \val
mov r1, #\len
bl phex
.endm

.macro debug_reloc_start
#ifdef DEBUG
kputc #'\n'
kphex r6, 8 /* processor id */
kputc #':'
kphex r7, 8 /* architecture id */
...........
...........
...........

Problem is happened in a context like this:

    I have a board use cpu S5PV210,and an ok kernel provide by the factory
anda  kernel download from kernel.org which carshed after printing "starting
kernel..." to dnw.
    To debug this,I want to test the macro kputc provided in this file¡ª¡ª
using ok kernel.
I add a line "kputc #'a' " after the tag ".text", then make error says
"undefined reference to `putc' ",it seems that compiler cant find "putc"
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Re: Need help adding platform UIO devices to board

Alexander Varnin — 2012-11-29T09:47:25

29.11.2012 13:29, Alexander Varnin пишет:
Seems to be solved.

Problem was due to lines

if (count != sizeof(s32))
return -EINVAL;

in uio_read kernel function.

I've made read of 4 bytes, and it is ok.

Re: Need help adding platform UIO devices to board

Alexander Varnin — 2012-11-29T09:38:02

Where to add printk?

29.11.2012 12:45, 游競雄 пишет:

Re: Need help adding platform UIO devices to board

Alexander Varnin — 2012-11-29T09:29:49

28.11.2012 23:03, Nicholas Mc Guire пишет:
Yes, sorry, stupid mistake.
But with the correct rights O_RDWR i get error 22 EINVAL both on read 
and write.
So problem is still there.