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Re: Acer arcade instantOn and grub

From: address@hidden
Subject: Re: Acer arcade instantOn and grub
Date: Mon, 23 Jul 2007 16:02:10 +0200

"address@hidden" <address@hidden> writes:


> i have a nice question for you :)
> in many acer laptops there is a second poweron button which is called "arcade 
> button".
> this is a normal power on button, as you can see:
> # more /proc/bus/input/devices
> I: Bus=0019 Vendor=0000 Product=0002 Version=0000
> N: Name="Power Button (FF)"
> P: Phys=button_power/button/input0
> S: Sysfs=/class/input/input0
> U: Uniq=
> H: Handlers=kbd event0
> B: EV=3
> B: KEY=100000 0 0 0
> ...
> I: Bus=0019 Vendor=0000 Product=0001 Version=0000
> N: Name="Power Button (CM)"
> P: Phys=PNP0C0C/button/input0
> S: Sysfs=/class/input/input2
> U: Uniq=
> H: Handlers=kbd event2
> B: EV=3
> B: KEY=100000 0 0 0
> when laptop is new (read "when you haven't overridden window's bootloader"), 
> pressing the normal power on button causes a normal boot sequence, but 
> pressing the arcade button causes a different boot sequence.
> i don't really want to restore windows boot loader, so: is there a way to 
> replicate this job with grub or grub2?
> for any further info please ask.

Is this information stored somehow?  So how can the bootloader
determine what is done?  In that case you can use scripting in GRUB 2
to make use of this information.  It can't be done yet, but surely
GRUB 2 can be modified to use this.


thanks for you answer, marco

follows a more deep description of the system

the original system uses a modified grub 0.93 chainloaded by ntldr.
the modifications of grub are released, but i can't replicate them on grub 0.97.

in short, in stage2 is addedd a function called console_getshift() which is 
this (following lines added in stage2/asm.S) :

/* 2004-12-01 CyberLink Corp. <> */
 * int console_getshift (void)
 * BIOS call "INT 16H Function 02H" to shift flags from keyboard
 *      Call with       %ah = 0x2
 *      Return:         %ah = destroyed by many BIOSes
 *                      %al = shift flags

        push    %ebp

        call    EXT_C(prot_to_real)

        movb    $0x2, %ah
        int     $0x16

        movb    %al, %dl                /* real_to_prot uses %eax */

        DATA32  call    EXT_C(real_to_prot)

        movb    %dl, %al
        and     $0xf, %eax

        pop     %ebp

then, a few references are added in other files:

stage2/term.h :

#ifndef STAGE1_5
/* 2004-12-01 CyberLink Corp. <> */
int console_getshift (void);

stage2/stage2.c :
   /* If SHOW_MENU is false, don't display the menu until ESC is pressed.  */
   if (! show_menu)
/* 2004-12-01 CyberLink Corp. <> */
#ifndef GRUB_UTIL
        if(console_getshift() & 0x3)
        goto boot_entry;

stage2/asm.S :

while compiling grub 0.97 with these patches added, there are no problems, but 
it seems that GRUB_UTIL is always defined, so the new code is never compiled.
trying to remove the ifndef directive, compilation fails with a "no 
console_getshift() defined" error.

can anybody help me with this?

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