Why secondary serial port is not activated on after upgrading to RHEL 6.3 ?

Solution Verified - Updated -

Issue

  • The secondary serial port (ttyS2) on a ATCA Molene board does not work anymore after updating to kernel-2.6.32-279.el6.
  • This serial port is used as a Serial over LAN (SoL) device to get serial console through the network provides following logs showing the ttyS2 is not creating or skipping during the kernel boot up process.
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:06: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial 0000:03:00.3: PCI INT C -> GSI 42 (level, low) -> IRQ 42
serial8250: skipping TxEn test for device [8086:1062] subsystem [8086:0000]

ttyS2 should be detected here as well, but is not with the new kernel.

Environment

  • Red Hat Enterprise Linux 6.3
  • kernel-2.6.32-279
  • ATCA Molene board

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