Bug 400191

Speed is determined by:

                                tspeed = cfgetospeed(&tp);

Presumably, the driver is lying.

If serial console is active, I don't think we can even guess at what speed it is
using.

Works in brief testing with a normal PC serial port - booting with
console=ttyS0,115200n1 shows up as 115200 correctly.

further investigation shows a misbehavior, maybe of the device driver or the
setserial tool.

$> ps ax |grep agetty
 3126 ttyS0    Ss+    0:00 /sbin/agetty ttyS0 19200 vt100-nav
 3136 pts/0    S+     0:00 grep agetty
$> setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal

The 'Baud_base' doesn't look right ...

Trying to change things using setserial, some will fail.
* its not possible to change the "UART" or "Baud_base".
* its possible to change the "Flags" value.

#####
$> setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal

$>  setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal

$>  setserial /dev/ttyS0 spd_vhi
$>  setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_vhi

$>  setserial /dev/ttyS0 spd_normal
$>  setserial -a /dev/ttyS0 baud_base 115200
$>  setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal

$>  setserial -a /dev/ttyS0 baud_base 19200
$>  setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal

$> cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A mmio:0x14540000200 irq:32 tx:329 rx:2 RTS|CTS|DTR
1: uart:16550A mmio:0x14540000300 irq:33 tx:0 rx:0
2: uart:16550A mmio:0x34540000200 irq:34 tx:0 rx:0
3: uart:16550A mmio:0x34540000300 irq:35 tx:0 rx:0

$> setserial /dev/ttyS0 uart 8250
$> cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A mmio:0x14540000200 irq:32 tx:329 rx:2 RTS|CTS|DTR
1: uart:16550A mmio:0x14540000300 irq:33 tx:0 rx:0
2: uart:16550A mmio:0x34540000200 irq:34 tx:0 rx:0
3: uart:16550A mmio:0x34540000300 irq:35 tx:0 rx:0
$> setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x0000, IRQ: 32
        Baud_base: 921600, close_delay: 50, divisor: 0
        closing_wait: 3000
        Flags: spd_normal



$> lsmod | grep 8250
8250_pci               39384  0 
8250                   64208  4 of_serial,8250_pci

anaconda doesn't write anything to /etc/inittab besides the default runlevel.  However, we do pass along cmdline options that you run the installer with to the finished system.  What happens if you do like Bill suggested and add a speed via console= ?

retested using a development ppc64 netboot image.
workaround using "console=ttyS0,19200" works fine.  
A automated solution would be welcome.

Automated would involve the port claiming the speed correctly. That would be a kernel (or hardware) issue.

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