On Fri, 2010-01-08 at 17:13 -0500, Ron Loftin wrote: > On Fri, 2010-01-08 at 16:54 -0500, Robert Heller wrote: > > I am in the process of migrating from running CentOS 4.8 (32-bit) to > > CentOS 5.4 (64-bit) on my AMD Sempron(tm) Processor LE-1300 system (it > > is running CentOS 4.8 32-bit because the disk images are from a > > previous PIII system), and things are 'interesting' WRT how the Lava > > Computer mfg Inc Quattro-PCI card is being handled. > > > > lspci (on CentOS 4.8 32-bit) yields: > > > > 01:0a.0 Serial controller: Lava Computer mfg Inc Quattro-PCI A > > 01:0a.1 Serial controller: Lava Computer mfg Inc Quattro-PCI B > > > > On the 32-bit system (2.6.9-89.0.18.EL.plus.c4 [i686]) dmesg says: > > > > Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing enabled > > ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A > > ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A > > ACPI: PCI Interrupt 0000:01:0a.0[A] -> GSI 16 (level, low) -> IRQ 233 > > ttyS4 at I/O 0xd080 (irq = 233) is a 16550A > > ttyS5 at I/O 0xd000 (irq = 233) is a 16550A > > ACPI: PCI Interrupt 0000:01:0a.1[A] -> GSI 16 (level, low) -> IRQ 233 > > ttyS6 at I/O 0xcc00 (irq = 233) is a 16550A > > ttyS7 at I/O 0xc880 (irq = 233) is a 16550A > > > > With the 64-bit kernel (2.6.18-164.el5 [x86_64]) I get: > > > > Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled > > serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A > > serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A > > 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A > > ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 19 > > ACPI: PCI Interrupt 0000:01:0a.0[A] -> Link [LNKC] -> GSI 19 (level, > > low) -> IRQ > > 177 > > 0000:01:0a.0: ttyS2 at I/O 0xd080 (irq = 177) is a 16550A > > 0000:01:0a.0: ttyS3 at I/O 0xd000 (irq = 177) is a 16550A > > ACPI: PCI Interrupt 0000:01:0a.1[A] -> Link [LNKC] -> GSI 19 (level, > > low) -> IRQ > > 177 > > Couldn't register serial port 0000:01:0a.1: -28 > > > > OK, instead of skipping ttyS2 and ttyS3 (normally old-school on-board COM3 and > > COM4) and allocating ttyS4 through ttyS7 for the Quattro, it is > > assigning ttyS2 and ttyS3 to the first pair, and then barfing (-28?) on > > the second pair. I looked at the config files and found: > > > > The 4.8 kernel has: > > > > # > > # Serial drivers > > # > > CONFIG_SERIAL_8250=y > > CONFIG_SERIAL_8250_CONSOLE=y > > CONFIG_SERIAL_8250_PCI=y > > CONFIG_SERIAL_8250_PNP=y > > CONFIG_SERIAL_8250_CS=m > > CONFIG_SERIAL_8250_NR_UARTS=32 > > CONFIG_SERIAL_8250_RUNTIME_UARTS=4 > > CONFIG_SERIAL_8250_EXTENDED=y > > CONFIG_SERIAL_8250_MANY_PORTS=y > > CONFIG_SERIAL_8250_SHARE_IRQ=y > > CONFIG_SERIAL_8250_DETECT_IRQ=y > > CONFIG_SERIAL_8250_RSA=y > > > > and the 5.4 kernel has: > > > > # > > # Serial drivers > > # > > CONFIG_SERIAL_8250=y > > CONFIG_SERIAL_8250_CONSOLE=y > > CONFIG_SERIAL_8250_CS=m > > # CONFIG_SERIAL_8250_ACPI is not set > > CONFIG_SERIAL_8250_NR_UARTS=4 > > CONFIG_SERIAL_8250_EXTENDED=y > > # CONFIG_SERIAL_8250_MANY_PORTS is not set > > CONFIG_SERIAL_8250_SHARE_IRQ=y > > CONFIG_SERIAL_8250_DETECT_IRQ=y > > CONFIG_SERIAL_8250_MULTIPORT=y > > CONFIG_SERIAL_8250_RSA=y > > > > Is what I am seeing a result of CONFIG_SERIAL_8250_ACPI and/or > > CONFIG_SERIAL_8250_MANY_PORTS not being set? > > > > Would upgrading to the CentOSPlus kernel help? > > I don't think you need the plus kernel. > > I did a similar dance when migrating to CentOS 5 on a box with a NetMOS > serial card. My research led me to the boot-time kernel arguments > related to the 8250 serial driver. Note that this has to be done as > arguments to the kernel, in grub, because the 8250 driver is NOT built > as a module, but is included in the basic kernel. After some banging > around, I wound up with the argument "8250.nr_uarts=8" appended to the > end of the "kernel" line in grub, and that made things work. > > This is sort of documented > in /usr/share/doc/kernel-doc-2.6.18/Documentation/kernel-parameters.txt. > You do have to understand how the kernel params work, but after you get > that straight, the rest follows. > > > > -- > Ron Loftin reloftin at twcny.rr.com --- One thing to see is from the kernel config he listed is the 4.8 can scale to 32 ports and the 5.4 only 4. If more than 4 is needed then a kernel recompile is needed. Has to change the value first. Like Ron said append it to the kernel line in grub. BTW, I never seen any docu on it when i had the problem of hanging port extenders on tty0 & 1 for modem banks. Actually later on I found a bug request in RHB for it. Also I have a problem with your post, heres why: The same for CentOS and RHEL 5. uname -ra Linux ethies 2.6.18-164.9.1.el5 #1 SMP Tue Dec 15 21:04:57 EST 2009 i686 i686 i386 GNU/Linux # # Serial drivers # CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_PCI=y CONFIG_SERIAL_8250_PNP=y CONFIG_SERIAL_8250_CS=m CONFIG_SERIAL_8250_NR_UARTS=32 CONFIG_SERIAL_8250_RUNTIME_UARTS=4 CONFIG_SERIAL_8250_EXTENDED=y CONFIG_SERIAL_8250_MANY_PORTS=y CONFIG_SERIAL_8250_SHARE_IRQ=y CONFIG_SERIAL_8250_DETECT_IRQ=y CONFIG_SERIAL_8250_RSA=y That can not be a """5""" Kernel you listed John