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Bug #141

open

GRUB payload hangs in HP Elitebooks

Added by Iru Cai about 7 years ago. Updated over 1 year ago.

Status:
New
Priority:
Normal
Assignee:
Iru Cai
Category:
-
Target version:
-
Start date:
09/19/2017
Due date:
% Done:

0%

Estimated time:
Affected versions:
Needs backport to:
Affected hardware:
Affected OS:

Description

There may be some problem when initializing the keyboard controller, but SeaBIOS payload works fine. Using GRUB payload directly or chainload GRUB payload with SeaBIOS will both hang the system.

I modified GRUB and find it hangs in set_scancodes(void), when calling the first write_mode. After grub_outb (mode, KEYBOARD_REG_DATA);, the keyboard_controller_wait_until_ready() function goes to an infinite loop.

write_mode (int mode)
{
  unsigned i;
  for (i = 0; i < GRUB_AT_TRIES; i++)
    {
      grub_uint8_t ack;
      keyboard_controller_wait_until_ready ();
      grub_outb (0xf0, KEYBOARD_REG_DATA);
      keyboard_controller_wait_until_ready ();
      grub_outb (mode, KEYBOARD_REG_DATA);
      keyboard_controller_wait_until_ready ();
      ack = wait_ack ();
      if (ack == GRUB_AT_NACK)
        continue;
      if (ack == GRUB_AT_ACK)
        break;
      return 0;
    }

  return (i != GRUB_AT_TRIES);
}

Files

Download all files
seabios.log (31.5 KB) seabios.log Iru Cai, 05/15/2020 02:53 PM
0005-at-keyboard-timeout.patch (1.09 KB) 0005-at-keyboard-timeout.patch Riku Viitanen, 04/22/2023 12:09 PM
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