Ben Hutchings <[email protected]> writes: > On Tue, 2012-10-16 at 20:44 +0200, Ferenc Wagner wrote: > >> This is an issue on IBM HS20 blades with serial over LAN console. In short, >> kernel messages get through all right, but user space messages are buffered >> until the qla2xxx FC HBA driver module is loaded. Everything is right if I >> reverse the order of the two console parameters, making /dev/console refer >> to the tty0 virtual console. For debugging, I made the following changes: > > Please test Linux 3.5 (as packaged in experimental) or 3.6.
I tried the same in another IBM Bladecenter with slightly different parts and firmware versions. There loading qla2xxx does not fix the user space console output. Even worse (on a virtual console): (initramfs) cat /proc/tty/driver/serial [ 225.538801] BUG: unable to handle kernel NULL pointer dereference at 0000009d [ 225.542505] IP: [<c11d15a1>] tty_ldisc_try+0xe/0x37 [ 225.542505] *pdpt = 00000000376f8001 *pde = 0000000000000000 [ 225.642256] Oops: 0000 [#1] SMP and the machine freezes here (sometimes after printing two lines only). Maybe http://thread.gmane.org/gmane.linux.kernel/1101432/focus=1303356? On the other hand: (initramfs) setserial -g /dev/ttyS0 /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 (initramfs) cat /proc/tty/driver/serial serinfo:1.0 driver revision: 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0 DSR|CD 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0 CTS|DSR|CD 2: uart:unknown port:000003E8 irq:4 3: uart:unknown port:000003E8 irq:3 But setserial -g /dev/ttyS1 or S2 or S3 does not help like this. (initramfs) echo hello >/dev/ttyS0 waits for 30 seconds then returns without printing anything. (initramfs) echo '<2>hello' >/dev/kmsg does not print to the serial console either, only to the VC (command line: console=ttyS0,19200n8r console=tty0 loglevel=3 break=top). User space console output appears on this machine after starting udev, but I haven't yet found out which module does this. -- Regards, Feri. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
