Red Hat Bugzilla – Bug 495762
vsp serial console hangs on HP-proliant systems
Last modified: 2010-06-28 07:49:52 EDT
Description of problem:
The HP Proliant systems have an option to use the serial console through the vsp (virtual serial port). This hangs on the latest rawhide 2.6.29-* kernels.
I am seeing this on a ProLiant DL365 G5 but I imagine it will be most if not all Proliants when used in this way. I will try to do some testing to find out what other systems are affected.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. boot a system set up for VSP console with console=ttyS0
Console output hangs until a key is pressed. As keys are pressed more output is generated but it is completely unusable as a console.
Looks like this is the TXEN bug checking not working right again. I added an option to the serial driver to force skipping the check like is done automatically for some Intel e1000 serial ports. Try adding '8250.skip_txen_test=1' to the boot options in kernel-184.108.40.206-83.fc11 or later.
Yes, just booted 220.127.116.11-85.fc11.x86_64 with 8250.skip_txen_test=1 and the serial console works properly now.
Is there some info I can provide to help figure out a fix? I am more than happy to do some digging on this.
The PCI IDs for the affected devices need to be added to pci_serial_quirks in drivers/serial/8250_pci.c like this example for an Intel board that has the same problem:
.vendor = PCI_VENDOR_ID_INTEL,
.device = PCI_DEVICE_ID_INTEL_82573L_SOL,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = skip_tx_en_setup,
And I guess I should submit the patch to add the parameter so there's a workaround for devices that aren't in the table.
Problem is the ilo vsp doesn't report itself as a PCI device. I will dig through the code and see if there is a way to do the same sort of quirk for it.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
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