On Fri, 27 Feb 2004 00:41:40 -0800 (PST),
Shantanu Gogate <[EMAIL PROTECTED]> wrote:
>putting debug messages around 'kdb_local_arch_setup' revealed that the function never
>returned !
>why ???
kdb_local_arch_setup and kdba_local_arch_cleanup try to reset the
keyboard to reduce a problem of frozen keyboards. They assume a
standard keyboard, I am guessing that your headless board does not have
a standard keyboard controller. In later versions of kdb (v4.0 is
pretty old), those functions only reset the keyboard if CONFIG_VT is
defined. v4.3 code looks like this.
/*
* On some Compaq Deskpro's, there is a keyboard freeze many times after
* exiting from the kdb. As kdb's keyboard handler is not interrupt-driven and
* uses a polled interface, it makes more sense to disable motherboard keyboard
* controller's OBF interrupts during kdb's polling.In case, of interrupts
* remaining enabled during kdb's polling, it may cause un-necessary
* interrupts being signalled during keypresses, which are also sometimes seen
* as spurious interrupts after exiting from kdb. This hack to disable OBF
* interrupts before entry to kdb and re-enabling them at kdb exit point also
* solves the keyboard freeze issue. These functions are called from
* kdb_local(), hence these are arch. specific setup and cleanup functions
* executing only on the local processor - [EMAIL PROTECTED]
*/
void kdba_local_arch_setup(void)
{
#ifdef CONFIG_VT_CONSOLE
unsigned char c;
while (kbd_read_status() & KBD_STAT_IBF);
kbd_write_command(KBD_CCMD_READ_MODE);
mdelay(1);
while (kbd_read_status() & KBD_STAT_IBF);
while ( !(kbd_read_status() & KBD_STAT_OBF) );
c = kbd_read_input();
c &= ~KBD_MODE_KBD_INT;
while (kbd_read_status() & KBD_STAT_IBF);
kbd_write_command(KBD_CCMD_WRITE_MODE);
mdelay(1);
while (kbd_read_status() & KBD_STAT_IBF);
kbd_write_output(c);
mdelay(1);
while (kbd_read_status() & KBD_STAT_IBF);
mdelay(1);
#endif /* CONFIG_VT_CONSOLE */
}
void kdba_local_arch_cleanup(void)
{
#ifdef CONFIG_VT_CONSOLE
unsigned char c;
while (kbd_read_status() & KBD_STAT_IBF);
kbd_write_command(KBD_CCMD_READ_MODE);
mdelay(1);
while (kbd_read_status() & KBD_STAT_IBF);
while ( !(kbd_read_status() & KBD_STAT_OBF) );
c = kbd_read_input();
c |= KBD_MODE_KBD_INT;
while (kbd_read_status() & KBD_STAT_IBF);
kbd_write_command(KBD_CCMD_WRITE_MODE);
mdelay(1);
while (kbd_read_status() & KBD_STAT_IBF);
kbd_write_output(c);
mdelay(1);
while (kbd_read_status() & KBD_STAT_IBF);
mdelay(1);
#endif /* CONFIG_VT_CONSOLE */
}
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