getting status of frontkeys

getting status of frontkeys

[Joachim Mammele]

Hi everybody,

I wrote a mail to this list some time ago wondering if it might be 
possible to get the status of some frontkeys of a tablet.

Vladimir answered me and mentioned that Grub Legacy wouldn't be 
supported any more. Would it be possible then with Grub2 instead?

Vladimir answered aswell the following:
 > bits9 = system("readFrontKey");
You can't use usual syscalls inside bootloader. GRUB2 has its own API 
which is somewhat posix-like but has no such things as "system", pipes 
or forks, and normally there shouldn't be any need.

I had a look at this page: 
http://www.gnu.org/software/grub/manual/grub.html#Command_002dline-and-menu-entry-commands

So I'm wondering if there might be any way to select the system to boot 
depending on which key is pressed?

Greetings
Joachiim




Here my old mail:
----

Hi everybody,
I have got a tablet with special frontkeys and I would like to install 
and adapt android on it. This works fine with the project android-x86.org

On grub I would like to select the bootitems with the frontkeys.
The frontkeys can be read with the following code (this is working,
file named readFrontKey.c).
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>
int main()
{
   unsigned char bits8, bits9, bits0, bitsA, bitsB, bitsC, bitsD,
bitsE, bits;
   if(ioperm(0x208, 8, 1) < 0) {
         perror("0x208");
         return 1;
   }
         bits = 32;
         outb(bits, 0x20A);
         outw(-16832, 0x20C);
         bits9 = inb(0x209);
         return bits9;
}
But when I add the following code to external/grub/stage2/stage2.c I get an
"undefined reference to `system' " error message:

The code I added to stage2.c (at roundabout line 391) is
bits9 = system("readFrontKey");
           if (bits9 == 64)
                 entryno = 1;
           if (bits9 == 32)
                 entryno = 2;
           if (bits9 == 16)
             entryno = 3;
           goto boot_entry;
       /* Check for a keypress, however if TIMEOUT has been expired
          (GRUB_TIMEOUT == -1) relax in GETKEY even if no key has been
          pressed.

stage2.c has stdlib.h included.

I added the program readfrontkey.c to Makefile.am and also adapted
Makefile.in
Any help woud be apreciated
Joachim Mammele

P.S. The repository that I use can be found here: 
http://android-x86.git.sourceforge.net/git/gitweb.cgi?p=android-x86/korg_external_grub.git;a=summary




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Re: getting status of frontkeys

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 16.03.2012 10:12, Joachim Mammele wrote:
>         bits = 32;
>         outb(bits, 0x20A);
>         outw(-16832, 0x20C);
>         bits9 = inb(0x209);
>         return bits9; 
This code is easy to port to GRUB2. Just have a look at cmostest command 
to see what wrapping you need and replace in* with grub_in* and out* 
with grub_out*

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko