On Sun, Oct 31, 2004 at 09:13:35PM +0100, Jan-Benedict Glaw wrote:
>
> So now, find out what v0 belongs to. Maybe compiling the kernel with
> debug infos (-g) and using objdump -S (for intermixing sources) will
> help you.
recompiling the kernel will take another few hours, but
I may try later. Using "objdump -S" I don't get any more info.
Building a kernel without the driver for the serial port
seems not so good for a Challenge S.
> "objdump -S" for starters, but it seems quite straight forward. Maybe
> paste the code of ip22zilog_receive_chars, I don't have that at hands
> right now...
Okay, here it is:
static void ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
struct zilog_channel *channel,
struct pt_regs *regs)
{
struct tty_struct *tty = up->port.info->tty; /* XXX info==NULL? */
while (1) {
unsigned char ch, r1;
if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
tty->flip.work.func((void *)tty);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
return; /* XXX Ignores SysRq when we nee
d it most. Fix. */
}
r1 = read_zsreg(channel, R1);
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
writeb(ERR_RES, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
}
ch = readb(&channel->control);
ZSDELAY();
/* This funny hack depends upon BRK_ABRT not interfering
* with the other bits we care about in R1.
*/
if (ch & BRK_ABRT)
r1 |= BRK_ABRT;
ch = readb(&channel->data);
ZSDELAY();
ch &= up->parity_mask;
if (ZS_IS_CONS(up) && (r1 & BRK_ABRT)) {
/* Wait for BREAK to deassert to avoid potentially
* confusing the PROM.
*/
while (1) {
ch = readb(&channel->control);
ZSDELAY();
if (!(ch & BRK_ABRT))
break;
}
ip22_do_break();
return;
}
/* A real serial line, record the character and status. */
*tty->flip.char_buf_ptr = ch;
*tty->flip.flag_buf_ptr = TTY_NORMAL;
up->port.icount.rx++;
if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
if (r1 & BRK_ABRT) {
r1 &= ~(PAR_ERR | CRC_ERR);
up->port.icount.brk++;
if (uart_handle_break(&up->port))
goto next_char;
}
else if (r1 & PAR_ERR)
up->port.icount.parity++;
else if (r1 & CRC_ERR)
up->port.icount.frame++;
if (r1 & Rx_OVR)
up->port.icount.overrun++;
r1 &= up->port.read_status_mask;
if (r1 & BRK_ABRT)
*tty->flip.flag_buf_ptr = TTY_BREAK;
else if (r1 & PAR_ERR)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (r1 & CRC_ERR)
*tty->flip.flag_buf_ptr = TTY_FRAME;
}
if (uart_handle_sysrq_char(&up->port, ch, regs))
goto next_char;
if (up->port.ignore_status_mask == 0xff ||
(r1 & up->port.ignore_status_mask) == 0) {
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
if ((r1 & Rx_OVR) &&
tty->flip.count < TTY_FLIPBUF_SIZE) {
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
next_char:
ch = readb(&channel->control);
ZSDELAY();
if (!(ch & Rx_CH_AV))
break;
}
tty_flip_buffer_push(tty);
}
mfg
Dennis
--
There is certainly no purpose in remaining in the dark
except long enough to clear from the mind
the illusion of ever having been in the light.
T.S. Eliot
