Re: Compaq Presario "reboot" problems

Re: Compaq Presario "reboot" problems

[Jeff V. Merkey]

Verified. I saw this problem a few weeks back and I am running Windows 
2000 and 2003 on separate systems now. Windows 2000
is such a pig it needs its own system in any event.

Jeff

linux-os (Dick Johnson) wrote:

>With Linux-2.4.26 I reported that if a Compaq gets rebooted while
>running Linux-2.4.26, it will not be able to restart Windows 2000.
>It cam restart Linux fine. Today, I tried the same thing with
>Linux-2.6.13.4. It fails, too.
>
>The symptoms are that you just "reboot" Linux. When the GRUB loader
>comes up, I select my Windows-2000/professional. That M$ Crap comes
>up to where it's just about to start the high-resolution screen.
>Then it stops forever, no interrupts, no nothing. I need to disconnect
>power and remove the battery to recover.
>
>It appears as though Linux is still restarting as a "warm boot",
>rather than a cold boot (in other words, putting magic in the
>shutdown byte of CMOS) so the hardware doesn't get properly
>initialized. Would somebody please check this out. When changing
>operating systems, you need a cold-boot.
>
>Cheers,
>Dick Johnson
>Penguin : Linux version 2.6.13.4 on an i686 machine (5589.44 BogoMips).
>Warning : 98.36% of all statistics are fiction.
>.
>
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>
>Thank you.
>-
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Compaq Presario "reboot" problems

[linux-os (Dick Johnson)]

With Linux-2.4.26 I reported that if a Compaq gets rebooted while
running Linux-2.4.26, it will not be able to restart Windows 2000.
It cam restart Linux fine. Today, I tried the same thing with
Linux-2.6.13.4. It fails, too.

The symptoms are that you just "reboot" Linux. When the GRUB loader
comes up, I select my Windows-2000/professional. That M$ Crap comes
up to where it's just about to start the high-resolution screen.
Then it stops forever, no interrupts, no nothing. I need to disconnect
power and remove the battery to recover.

It appears as though Linux is still restarting as a "warm boot",
rather than a cold boot (in other words, putting magic in the
shutdown byte of CMOS) so the hardware doesn't get properly
initialized. Would somebody please check this out. When changing
operating systems, you need a cold-boot.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.44 BogoMips).
Warning : 98.36% of all statistics are fiction.
.

****************************************************************
The information transmitted in this message is confidential and may be privileged.  Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited.  If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them.

Thank you.

Re: Compaq Presario "reboot" problems

[Ondrej Zary]

linux-os (Dick Johnson) wrote:
> It appears as though Linux is still restarting as a "warm boot",
> rather than a cold boot (in other words, putting magic in the
> shutdown byte of CMOS) so the hardware doesn't get properly
> initialized. Would somebody please check this out. When changing
> operating systems, you need a cold-boot.
No, it does not. I know that my desktop PC reboots with a beep (and 
shows CPU information) from Linux - and it does not beep when rebooting 
from Windows 98.
Some BIOSes don't like when some devices are in some state. One example 
is my DTK FortisPro TOP-5A notebook - when rebooted from Linux, it hangs 
during POST - the fix was to add setpci <someting> to shutdown scripts 
to zero-out some cardbus controller registers.

-- 
Ondrej Zary

Re: Compaq Presario "reboot" problems

[Denis Vlasenko]

On Friday 18 November 2005 01:26, Ondrej Zary wrote:
> linux-os (Dick Johnson) wrote:
> > It appears as though Linux is still restarting as a "warm boot",
> > rather than a cold boot (in other words, putting magic in the
> > shutdown byte of CMOS) so the hardware doesn't get properly
> > initialized. Would somebody please check this out. When changing
> > operating systems, you need a cold-boot.
> No, it does not. I know that my desktop PC reboots with a beep (and 
> shows CPU information) from Linux - and it does not beep when rebooting 
> from Windows 98.
> Some BIOSes don't like when some devices are in some state. One example 
> is my DTK FortisPro TOP-5A notebook - when rebooted from Linux, it hangs 
> during POST - the fix was to add setpci <someting> to shutdown scripts 
> to zero-out some cardbus controller registers.

Did you report it to lkml and/or dirver maintainer?
--
vda 

Re: Compaq Presario "reboot" problems

[Denis Vlasenko]

On Thursday 17 November 2005 20:51, linux-os (Dick Johnson) wrote:
> 
> With Linux-2.4.26 I reported that if a Compaq gets rebooted while
> running Linux-2.4.26, it will not be able to restart Windows 2000.
> It cam restart Linux fine. Today, I tried the same thing with
> Linux-2.6.13.4. It fails, too.
> 
> The symptoms are that you just "reboot" Linux. When the GRUB loader
> comes up, I select my Windows-2000/professional. That M$ Crap comes
> up to where it's just about to start the high-resolution screen.
> Then it stops forever, no interrupts, no nothing. I need to disconnect
> power and remove the battery to recover.
> 
> It appears as though Linux is still restarting as a "warm boot",
> rather than a cold boot (in other words, putting magic in the
> shutdown byte of CMOS) so the hardware doesn't get properly
> initialized. Would somebody please check this out. When changing
> operating systems, you need a cold-boot.

Can you check which driver does that? The test would be to
boot a special Linux setup which reboots immediately
(say, wuth init=/some/reboot_script.sh boot param).

Then start removing drivers from kernel until you
can boot Win successfully after Linux reboots.
--
vda

Re: Compaq Presario "reboot" problems

[linux-os (Dick Johnson)]

On Fri, 18 Nov 2005, Denis Vlasenko wrote:

> On Thursday 17 November 2005 20:51, linux-os (Dick Johnson) wrote:
>>
>> With Linux-2.4.26 I reported that if a Compaq gets rebooted while
>> running Linux-2.4.26, it will not be able to restart Windows 2000.
>> It cam restart Linux fine. Today, I tried the same thing with
>> Linux-2.6.13.4. It fails, too.
>>
>> The symptoms are that you just "reboot" Linux. When the GRUB loader
>> comes up, I select my Windows-2000/professional. That M$ Crap comes
>> up to where it's just about to start the high-resolution screen.
>> Then it stops forever, no interrupts, no nothing. I need to disconnect
>> power and remove the battery to recover.
>>
>> It appears as though Linux is still restarting as a "warm boot",
>> rather than a cold boot (in other words, putting magic in the
>> shutdown byte of CMOS) so the hardware doesn't get properly
>> initialized. Would somebody please check this out. When changing
>> operating systems, you need a cold-boot.
>
> Can you check which driver does that? The test would be to
> boot a special Linux setup which reboots immediately
> (say, wuth init=/some/reboot_script.sh boot param).
>
> Then start removing drivers from kernel until you
> can boot Win successfully after Linux reboots.
> --
> vda
>

Yes. Just as soom as I finish a "work break". I'll get back.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.44 BogoMips).
Warning : 98.36% of all statistics are fiction.
.

****************************************************************
The information transmitted in this message is confidential and may be privileged.  Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited.  If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them.

Thank you.

Re: Compaq Presario "reboot" problems

[linux-os (Dick Johnson)]

[-- Attachment #1: Type: text/plain, Size: 3324 bytes --]


On Fri, 18 Nov 2005, Denis Vlasenko wrote:

> On Thursday 17 November 2005 20:51, linux-os (Dick Johnson) wrote:
>>
>> With Linux-2.4.26 I reported that if a Compaq gets rebooted while
>> running Linux-2.4.26, it will not be able to restart Windows 2000.
>> It cam restart Linux fine. Today, I tried the same thing with
>> Linux-2.6.13.4. It fails, too.
>>
>> The symptoms are that you just "reboot" Linux. When the GRUB loader
>> comes up, I select my Windows-2000/professional. That M$ Crap comes
>> up to where it's just about to start the high-resolution screen.
>> Then it stops forever, no interrupts, no nothing. I need to disconnect
>> power and remove the battery to recover.
>>
>> It appears as though Linux is still restarting as a "warm boot",
>> rather than a cold boot (in other words, putting magic in the
>> shutdown byte of CMOS) so the hardware doesn't get properly
>> initialized. Would somebody please check this out. When changing
>> operating systems, you need a cold-boot.
>
> Can you check which driver does that? The test would be to
> boot a special Linux setup which reboots immediately
> (say, wuth init=/some/reboot_script.sh boot param).
>
> Then start removing drivers from kernel until you
> can boot Win successfully after Linux reboots.
> --
> vda

I booted into a shell from a floppy disk. There were no drivers
installed, not even the IDE driver. I could not reboot windows
after linux was up and rebooted. This was Linux-2.6.13.4. Then
I tried linux-2.4.26 which corresponds to the version when I
first reported this problem. The same thing happens. Therefore,
I temporarily modified linux-2.6.13.4 to force a triple-fault
and processor reset when doing a reboot. With this temporary
modification it is possible to boot windows after Linux was
running.

This is the reboot patch. It is not a "solution", just something
that shows that the current reboot code doesn't force the BIOS
to start from scratch, which is essential when changing operating
systems.


--- linux-2.6.13.4/arch/i386/kernel/reboot.c.orig	2005-11-18 08:29:12.000000000 -0500
+++ linux-2.6.13.4/arch/i386/kernel/reboot.c	2005-11-18 08:52:40.000000000 -0500
@@ -337,6 +337,11 @@

  void machine_restart(char * __unused)
  {
+        for(;;) {
+	__asm__ __volatile__("\tmovl %cr0, %eax\n"
+			     "\tandl $~0x80000000,  %eax\n"
+			     "\tmovl %eax, %cr0\n");
+        }
  	machine_shutdown();
  	machine_emergency_restart();
  }

Just in case the M$ mailer screws up everything, the patch
is attached also.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.54 BogoMips).
Warning : 98.36% of all statistics are fiction.
.


****************************************************************
The information transmitted in this message is confidential and may be privileged.  Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited.  If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them.

Thank you.

[-- Attachment #2: reboot.patch --]
[-- Type: TEXT/PLAIN, Size: 450 bytes --]

--- linux-2.6.13.4/arch/i386/kernel/reboot.c.orig	2005-11-18 08:29:12.000000000 -0500
+++ linux-2.6.13.4/arch/i386/kernel/reboot.c	2005-11-18 08:52:40.000000000 -0500
@@ -337,6 +337,11 @@
 
 void machine_restart(char * __unused)
 {
+        for(;;) {
+	__asm__ __volatile__("\tmovl %cr0, %eax\n"
+			     "\tandl $~0x80000000,  %eax\n"
+			     "\tmovl %eax, %cr0\n");
+        }
 	machine_shutdown();
 	machine_emergency_restart();
 }

Re: Compaq Presario "reboot" problems

[Nick Warne]

On Fri, 18 Nov 2005, Denis Vlasenko wrote:

> On Thursday 17 November 2005 20:51, linux-os (Dick Johnson) wrote:
>>
>> With Linux-2.4.26 I reported that if a Compaq gets rebooted while
>> running Linux-2.4.26, it will not be able to restart Windows 2000.
>> It cam restart Linux fine. Today, I tried the same thing with
>> Linux-2.6.13.4. It fails, too.

I am following this thread and this thought just occurred to me.

A few years back I installed Linux on a Compaq box and used fdisk etc. as you 
do.  It turned out I wiped the BIOS settings, and further investigation at 
the time revealed that they use a hidden partition on the drive for the BIOS 
stuff.  I told fdisk to wipe all.

After this, the machine worked ok, just that I had no BIOS options at all - it 
beeped a bit at me at boot, but came up OK and worked for a few years until I 
binned it.

Just a thought on what is going on here.

Nick
-- 
http://sourceforge.net/projects/quake2plus/

"Person who say it cannot be done should not interrupt person doing it."
-Chinese Proverb

Re: Compaq Presario "reboot" problems

[Robert Hancock]

linux-os (Dick Johnson) wrote:
> 
> With Linux-2.4.26 I reported that if a Compaq gets rebooted while
> running Linux-2.4.26, it will not be able to restart Windows 2000.
> It cam restart Linux fine. Today, I tried the same thing with
> Linux-2.6.13.4. It fails, too.
> 
> The symptoms are that you just "reboot" Linux. When the GRUB loader
> comes up, I select my Windows-2000/professional. That M$ Crap comes
> up to where it's just about to start the high-resolution screen.
> Then it stops forever, no interrupts, no nothing. I need to disconnect
> power and remove the battery to recover.
> 
> It appears as though Linux is still restarting as a "warm boot",
> rather than a cold boot (in other words, putting magic in the
> shutdown byte of CMOS) so the hardware doesn't get properly
> initialized. Would somebody please check this out. When changing
> operating systems, you need a cold-boot.

This sounds more like the BIOS is not properly reinitializing all 
hardware and expects it to be in some state which Linux does not leave 
it in. BIOS update available?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/

Re: Compaq Presario "reboot" problems

[Ondrej Zary]

Denis Vlasenko wrote:
> On Friday 18 November 2005 01:26, Ondrej Zary wrote:
> 
>>linux-os (Dick Johnson) wrote:
>>
>>>It appears as though Linux is still restarting as a "warm boot",
>>>rather than a cold boot (in other words, putting magic in the
>>>shutdown byte of CMOS) so the hardware doesn't get properly
>>>initialized. Would somebody please check this out. When changing
>>>operating systems, you need a cold-boot.
>>
>>No, it does not. I know that my desktop PC reboots with a beep (and 
>>shows CPU information) from Linux - and it does not beep when rebooting 
>>from Windows 98.
>>Some BIOSes don't like when some devices are in some state. One example 
>>is my DTK FortisPro TOP-5A notebook - when rebooted from Linux, it hangs 
>>during POST - the fix was to add setpci <someting> to shutdown scripts 
>>to zero-out some cardbus controller registers.
> 
> 
> Did you report it to lkml and/or dirver maintainer?

Not yet. I haven't tried any kernel newer than 2.6.8.1 (because of the 
monitor mode patch for orinoco wifi card) so I don't know if the problem 
is still there.
Also Linux does not like APM on this notebook. But I don't have free 
time to play with thing like these...

-- 
Ondrej Zary

Re: Compaq Presario "reboot" problems

[Denis Vlasenko]

On Friday 18 November 2005 16:15, linux-os (Dick Johnson) wrote:
> On Fri, 18 Nov 2005, Denis Vlasenko wrote:
> 
> > On Thursday 17 November 2005 20:51, linux-os (Dick Johnson) wrote:
> >> It appears as though Linux is still restarting as a "warm boot",
> >> rather than a cold boot (in other words, putting magic in the
> >> shutdown byte of CMOS) so the hardware doesn't get properly
> >> initialized. Would somebody please check this out. When changing
> >> operating systems, you need a cold-boot.
> >
> > Can you check which driver does that? The test would be to
> > boot a special Linux setup which reboots immediately
> > (say, wuth init=/some/reboot_script.sh boot param).
> >
> > Then start removing drivers from kernel until you
> > can boot Win successfully after Linux reboots.
> > --
> > vda
> 
> I booted into a shell from a floppy disk. There were no drivers
> installed, not even the IDE driver. I could not reboot windows
> after linux was up and rebooted. This was Linux-2.6.13.4. Then
> I tried linux-2.4.26 which corresponds to the version when I
> first reported this problem. The same thing happens. Therefore,
> I temporarily modified linux-2.6.13.4 to force a triple-fault
> and processor reset when doing a reboot. With this temporary
> modification it is possible to boot windows after Linux was
> running.
> 
> This is the reboot patch. It is not a "solution", just something
> that shows that the current reboot code doesn't force the BIOS
> to start from scratch, which is essential when changing operating
> systems.
> 
> 
> --- linux-2.6.13.4/arch/i386/kernel/reboot.c.orig	2005-11-18 08:29:12.000000000 -0500
> +++ linux-2.6.13.4/arch/i386/kernel/reboot.c	2005-11-18 08:52:40.000000000 -0500
> @@ -337,6 +337,11 @@
> 
>   void machine_restart(char * __unused)
>   {
> +        for(;;) {
> +	__asm__ __volatile__("\tmovl %cr0, %eax\n"
> +			     "\tandl $~0x80000000,  %eax\n"
> +			     "\tmovl %eax, %cr0\n");
> +        }
>   	machine_shutdown();
>   	machine_emergency_restart();
>   }

Does reboot=cb ('cold', 'thru BIOS') work for you?

I read arch/i386/kernel/reboot.c and it looks like reboot=cb
kernel param will triple fault too:

static int reboot_mode;
static int reboot_thru_bios;

static int __init reboot_setup(char *str)
{
        while(1) {
                switch (*str) {
                case 'w': /* "warm" reboot (no memory testing etc) */
                        reboot_mode = 0x1234;
                        break;
                case 'c': /* "cold" reboot (with memory testing etc) */
                        reboot_mode = 0x0;
                        break;
                case 'b': /* "bios" reboot by jumping through the BIOS */
                        reboot_thru_bios = 1;
                        break;
                case 'h': /* "hard" reboot by toggling RESET and/or crashing the CPU */
                        reboot_thru_bios = 0;
                        break;
                }
                if((str = strchr(str,',')) != NULL)
                        str++;
                else
                        break;
        }
        return 1;
}

__setup("reboot=", reboot_setup);
...
void machine_emergency_restart(void)
{
        if (!reboot_thru_bios) {
                if (efi_enabled) {
                        efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
                        load_idt(&no_idt);
                        __asm__ __volatile__("int3");
                }
                /* rebooting needs to touch the page at absolute addr 0 */
                *((unsigned short *)__va(0x472)) = reboot_mode;
                for (;;) {
                        mach_reboot_fixups(); /* for board specific fixups */
                        mach_reboot();
                        /* That didn't work - force a triple fault.. */
                        load_idt(&no_idt);
                        __asm__ __volatile__("int3");
                }
        }
        if (efi_enabled)
                efi.reset_system(EFI_RESET_WARM, EFI_SUCCESS, 0, NULL);

        machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
}

void machine_restart(char * __unused)
{
        machine_shutdown();
        machine_emergency_restart();
}


If it does not, try this reboot=tc - this is closely resembles
what you proposed in your mail (pseudo-patch):

static int __init reboot_setup(char *str)
{
        while(1) {
                switch (*str) {
+               case 't': /* "triple fault" reboot */
+                       reboot_thru_bios = 2;
+                       break;
                case 'w': /* "warm" reboot (no memory testing etc) */
                        reboot_mode = 0x1234;
                        break;
...
void machine_emergency_restart(void)
{
+       if (reboot_thru_bios == 2) {
+               *((unsigned short *)__va(0x472)) = reboot_mode;
+               load_idt(&no_idt);
+               __asm__ __volatile__("int3");
+	}
        if (!reboot_thru_bios) {
                if (efi_enabled) {
                        efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
--
vda

Re: Compaq Presario "reboot" problems

[linux-os (Dick Johnson)]

On Sat, 19 Nov 2005, Denis Vlasenko wrote:

> On Friday 18 November 2005 16:15, linux-os (Dick Johnson) wrote:
>> On Fri, 18 Nov 2005, Denis Vlasenko wrote:
>>
>>> On Thursday 17 November 2005 20:51, linux-os (Dick Johnson) wrote:
>>>> It appears as though Linux is still restarting as a "warm boot",
>>>> rather than a cold boot (in other words, putting magic in the
>>>> shutdown byte of CMOS) so the hardware doesn't get properly
>>>> initialized. Would somebody please check this out. When changing
>>>> operating systems, you need a cold-boot.
>>>
>>> Can you check which driver does that? The test would be to
>>> boot a special Linux setup which reboots immediately
>>> (say, wuth init=/some/reboot_script.sh boot param).
>>>
>>> Then start removing drivers from kernel until you
>>> can boot Win successfully after Linux reboots.
>>> --
>>> vda
>>
>> I booted into a shell from a floppy disk. There were no drivers
>> installed, not even the IDE driver. I could not reboot windows
>> after linux was up and rebooted. This was Linux-2.6.13.4. Then
>> I tried linux-2.4.26 which corresponds to the version when I
>> first reported this problem. The same thing happens. Therefore,
>> I temporarily modified linux-2.6.13.4 to force a triple-fault
>> and processor reset when doing a reboot. With this temporary
>> modification it is possible to boot windows after Linux was
>> running.
>>
>> This is the reboot patch. It is not a "solution", just something
>> that shows that the current reboot code doesn't force the BIOS
>> to start from scratch, which is essential when changing operating
>> systems.
>>
>>
>> --- linux-2.6.13.4/arch/i386/kernel/reboot.c.orig	2005-11-18 08:29:12.000000000 -0500
>> +++ linux-2.6.13.4/arch/i386/kernel/reboot.c	2005-11-18 08:52:40.000000000 -0500
>> @@ -337,6 +337,11 @@
>>
>>   void machine_restart(char * __unused)
>>   {
>> +        for(;;) {
>> +	__asm__ __volatile__("\tmovl %cr0, %eax\n"
>> +			     "\tandl $~0x80000000,  %eax\n"
>> +			     "\tmovl %eax, %cr0\n");
>> +        }
>>   	machine_shutdown();
>>   	machine_emergency_restart();
>>   }
>
> Does reboot=cb ('cold', 'thru BIOS') work for you?
>
> I read arch/i386/kernel/reboot.c and it looks like reboot=cb
> kernel param will triple fault too:
>
> static int reboot_mode;
> static int reboot_thru_bios;
>
> static int __init reboot_setup(char *str)
> {
>        while(1) {
>                switch (*str) {
>                case 'w': /* "warm" reboot (no memory testing etc) */
>                        reboot_mode = 0x1234;
>                        break;
>                case 'c': /* "cold" reboot (with memory testing etc) */
>                        reboot_mode = 0x0;
>                        break;
>                case 'b': /* "bios" reboot by jumping through the BIOS */
>                        reboot_thru_bios = 1;
>                        break;
>                case 'h': /* "hard" reboot by toggling RESET and/or crashing the CPU */
>                        reboot_thru_bios = 0;
>                        break;
>                }
>                if((str = strchr(str,',')) != NULL)
>                        str++;
>                else
>                        break;
>        }
>        return 1;
> }
>
> __setup("reboot=", reboot_setup);
> ...
> void machine_emergency_restart(void)
> {
>        if (!reboot_thru_bios) {
>                if (efi_enabled) {
>                        efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
>                        load_idt(&no_idt);
>                        __asm__ __volatile__("int3");
>                }
>                /* rebooting needs to touch the page at absolute addr 0 */
>                *((unsigned short *)__va(0x472)) = reboot_mode;
>                for (;;) {
>                        mach_reboot_fixups(); /* for board specific fixups */
>                        mach_reboot();
>                        /* That didn't work - force a triple fault.. */
>                        load_idt(&no_idt);
>                        __asm__ __volatile__("int3");
>                }
>        }
>        if (efi_enabled)
>                efi.reset_system(EFI_RESET_WARM, EFI_SUCCESS, 0, NULL);
>
>        machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
> }
>
> void machine_restart(char * __unused)
> {
>        machine_shutdown();
>        machine_emergency_restart();
> }
>
>
> If it does not, try this reboot=tc - this is closely resembles
> what you proposed in your mail (pseudo-patch):
>
> static int __init reboot_setup(char *str)
> {
>        while(1) {
>                switch (*str) {
> +               case 't': /* "triple fault" reboot */
> +                       reboot_thru_bios = 2;
> +                       break;
>                case 'w': /* "warm" reboot (no memory testing etc) */
>                        reboot_mode = 0x1234;
>                        break;
> ...
> void machine_emergency_restart(void)
> {
> +       if (reboot_thru_bios == 2) {
> +               *((unsigned short *)__va(0x472)) = reboot_mode;
> +               load_idt(&no_idt);
> +               __asm__ __volatile__("int3");
> +	}
>        if (!reboot_thru_bios) {
>                if (efi_enabled) {
>                        efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
> --
> vda

I don't know how to make `reboot` or `init 0` take the required
parameters! I don't know how to get from user-mode into the kernel
code with any such parameters. I looked through `proc` and couldn't
find anything for such parameters either:

Script started on Mon 21 Nov 2005 12:42:11 PM EST
[root@chaos root]# reboot=cb
[root@chaos root]# strace reboot=cb
strace: reboot=cb: command not found
[root@chaos root]# strace reboot -cb\b
execve("/sbin/reboot", ["reboot", "-cb"], [/* 22 vars */]) = 0
uname({sys="Linux", node="chaos.analogic.com", ...}) = 0
brk(0)                                  = 0x804b000
open("/etc/ld.so.preload", O_RDONLY)    = 3
fstat64(3, {st_mode=S_IFREG|0666, st_size=0, ...}) = 0
close(3)                                = 0
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=123802, ...}) = 0
old_mmap(NULL, 123802, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f3e000
close(3)                                = 0
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300{\230"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1455084, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f3d000
old_mmap(0x4a973000, 1158124, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4a973000
old_mmap(0x4aa88000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x115000) = 0x4aa88000
old_mmap(0x4aa8c000, 7148, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4aa8c000
close(3)                                = 0
mprotect(0x4aa88000, 8192, PROT_READ)   = 0
mprotect(0x4a96b000, 4096, PROT_READ)   = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7f3d540, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7f3e000, 123802)              = 0
geteuid32()                             = 0
write(2, "usage: reboot [-n] [-w] [-d] [-f"..., 44usage: reboot [-n] [-w] [-d] [-f] [-i] [-p]
) = 44
write(2, "\t\t  -n: don\'t sync before reboot"..., 47		  -n: don't sync before rebooting the system
) = 47
write(2, "\t\t  -w: only write a wtmp reboot"..., 50		  -w: only write a wtmp reboot record and exit.
) = 50
write(2, "\t\t  -d: don\'t write a wtmp recor"..., 35		  -d: don't write a wtmp record.
) = 35
write(2, "\t\t  -f: force halt/reboot, don\'t"..., 48		  -f: force halt/reboot, don't call shutdown.
) = 48
write(2, "\t\t  -p: power down the system (i"..., 62		  -p: power down the system (if possible, otherwise reboot)
) = 62
exit_group(1)                           = ?
[root@chaos root]#
[root@chaos root]# exit
exit

Script done on Mon 21 Nov 2005 12:43:09 PM EST


`man reboot` doesn't show any parameters.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.52 BogoMips).
Warning : 98.36% of all statistics are fiction.
.

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The information transmitted in this message is confidential and may be privileged.  Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited.  If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them.

Thank you.

Re: Compaq Presario "reboot" problems

[Stefan Seyfried]

linux-os (Dick Johnson) wrote:

> I don't know how to make `reboot` or `init 0` take the required
> parameters! I don't know how to get from user-mode into the kernel
> code with any such parameters. I looked through `proc` and couldn't
> find anything for such parameters either:
> 
> Script started on Mon 21 Nov 2005 12:42:11 PM EST
> [root@chaos root]# reboot=cb
> [root@chaos root]# strace reboot=cb
> strace: reboot=cb: command not found
> [root@chaos root]# strace reboot -cb\b

Pass it to the kernel at the bootloader prompt. Like the "vga=6" and
"root=/foo/bar" you have somewhere in there.

-- 
Stefan Seyfried                  \ "I didn't want to write for pay. I
QA / R&D Team Mobile Devices      \ wanted to be paid for what I write."
SUSE LINUX Products GmbH, Nürnberg \                    -- Leonard Cohen

Re: Compaq Presario "reboot" problems

[linux-os (Dick Johnson)]

On Mon, 21 Nov 2005, Stefan Seyfried wrote:

> linux-os (Dick Johnson) wrote:
>
>> I don't know how to make `reboot` or `init 0` take the required
>> parameters! I don't know how to get from user-mode into the kernel
>> code with any such parameters. I looked through `proc` and couldn't
>> find anything for such parameters either:
>>
>> Script started on Mon 21 Nov 2005 12:42:11 PM EST
>> [root@chaos root]# reboot=cb
>> [root@chaos root]# strace reboot=cb
>> strace: reboot=cb: command not found
>> [root@chaos root]# strace reboot -cb\b
>
> Pass it to the kernel at the bootloader prompt. Like the "vga=6" and
> "root=/foo/bar" you have somewhere in there.
>
> --
> Stefan Seyfried                  \ "I didn't want to write for pay. I
> QA / R&D Team Mobile Devices      \ wanted to be paid for what I write."
> SUSE LINUX Products GmbH, Nürnberg \                    -- Leonard Cohen
>

Okay, the results are the same. The machine reboots. It doesn't
run the memory-test so it probably didn't cold-boot. It's hard to
tell with these lap-tops because the time in the BIOS is so
brief. Anyway, it reboots into Linux, but can't reboot into Windows
as before.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.55 BogoMips).
Warning : 98.36% of all statistics are fiction.

****************************************************************
The information transmitted in this message is confidential and may be privileged.  Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited.  If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them.

Thank you.

Re: Compaq Presario "reboot" problems

[Denis Vlasenko]

On Tuesday 22 November 2005 16:09, linux-os (Dick Johnson) wrote:
> Okay, the results are the same. The machine reboots. It doesn't
> run the memory-test so it probably didn't cold-boot. It's hard to
> tell with these lap-tops because the time in the BIOS is so
> brief. Anyway, it reboots into Linux, but can't reboot into Windows
> as before.

You may want to try to add triple-fault reset as suggested here
(based on your own idea actually):

> If it does not, try this reboot=tc - this is closely resembles
> what you proposed in your mail (pseudo-patch):
>
> static int __init reboot_setup(char *str)
> {
>        while(1) {
>                switch (*str) {
> +               case 't': /* "triple fault" reboot */
> +                       reboot_thru_bios = 2;
> +                       break;
>                case 'w': /* "warm" reboot (no memory testing etc) */
>                        reboot_mode = 0x1234;
>                        break;
> ...
> void machine_emergency_restart(void)
> {
> +       if (reboot_thru_bios == 2) {
> +               *((unsigned short *)__va(0x472)) = reboot_mode;
> +               load_idt(&no_idt);
> +               __asm__ __volatile__("int3");
> +     }
>        if (!reboot_thru_bios) {
>                if (efi_enabled) {
>                        efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
--
vda