Debian 6, 10 serial ports Why only 6 of the remaining 4 are banned

0.946441] serial:8250/16550 driver, 6 ports, IRQ sharing enabled
[    0.946533] serial8250:ttys0 at I/O 0x3f8 (IRQ = 4) is a 16550A
[    0.946623] serial8250:ttys1 at I/o 0x2f8 (IRQ = 3) is a 16550A
[    0.946896] 00:06:ttys4 at I/o 0x210 (IRQ = one) is a 16550A
[    0.947012] 00:07:ttys5 at I/O 0x218 (IRQ = one) is a 16550A
[    0.947128] 00:08:ttys2 at I/o 0x220 (IRQ = one) is a 16550A
[    0. 947244] 00:09:ttys3 at I/o 0x228 (IRQ = one) is a 16550A
[    0.947369] 00:0b:ttys0 at I/o 0x3f8 (IRQ = 4) is a 16550A
[    0.947486] 00:0c:ttys1 at I/o 0x2f8 (IRQ = 3) is a 16550A
[    0.947718] Seri Al 00:0e:disabled
[    0.947915] serial 00:0f:disabled
[    0.948094] serial 00:10:disabled
[    0.948271] serial 00:11:disabled


Hardware is   intel (R) ich9m LPC Interface Controller-2 919 Serial Port

====================================================

Workaround Red Section,

grub_cmdline_linux_default= "Quiet Splash nomodeset video=uvesafb:mode_option=800
X600-24,mtrr=3,scroll=ywrap 8250.nr_uarts=10"
Grub_cmdline_linux= ""

Then remember to execute Update-grub

In addition, a patch is required.

Don't know why, the master told me.

http://files.cnblogs.com/files/MysticBoy/sio_irq_share.7z

Installation Introduction

1. Tar XF sio_irq_share.tar.gz

2. CP Sio_irq_share/sio_share/bin

3. CP SIO_IRQ_SHARE/SIO_SHARE.SH/ETC/INIT.D

4. Cd/etc/init.d

5. UPDATE-RC.D sio_share.sh defaults 00

6. Reboot

7. Check the boot log boot.log or you can see "Fintek 216 SIO Configuration Successful" on the boot screen

Then the installation is complete, (Cat/var/log/boot.log | grep fintek)

Remove Patches

1. Update-rc.d-f sio_share.sh Remove

2. Rm/bin/sio_share

3. rm/etc/init.d/sio_share.sh

4. Reboot

Debian 6, 10 serial ports Why only 6 of the remaining 4 are banned