Messages in this thread Patch in this message | | | Date | Wed, 02 May 2001 20:52:36 +0200 | From | Fabrice Gautier <> | Subject | Re: serial console problems with 2.4.4 |
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On 02 May 2001 10:37:21 -0600 ebiederm@xmission.com (Eric W. Biederman) wrote:
> Fabrice Gautier <gautier@email.enst.fr> writes: > > So this this probably a sulogin/mingetty problem. They should set the > > CREAD flag in your tty c_cflag. > > > > the patch for busybox repalced the line > > tty.c_cflag |= HUPCL|CLOCAL > > by > > tty.c_cflag |= CREAD|HUPCL|CLOCAL > > > > Hope this help. > > This part is correct. > > However the kernel sets CREAD by default.
Are your sure? Wasn't this the behaviour for 2.4.2 but changed in 2.4.3
> sysvinit (and possibly other inits) clears CREAD.
In my case I was using busybox as init. So there is no sysinit or any other init called before this line.
> I wish I knew where the breakage actually occured.
Just look at this diff on serial.c between 2.4.2 and 2.4.3:
--- serial.c Sat Apr 21 17:22:53 2001 +++ ../../../linux-2.4.2/drivers/char/serial.c Sat Feb 17 01:02:36 2001 @@ -1764,8 +1765,8 @@ /* * !!! ignore all characters if CREAD is not set */ -// if ((cflag & CREAD) == 0) -// info->ignore_status_mask |= UART_LSR_DR; + if ((cflag & CREAD) == 0) + info->ignore_status_mask |= UART_LSR_DR; save_flags(flags); cli(); if (uart_config[info->state->type].flags & UART_STARTECH) { serial_outp(info, UART_LCR, 0xBF);
-- Fabrice Gautier <gautier@email.enstfr>
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