Hi,I would like to enable a trace event early so that i can view the debug statements trace generated during usb 3.0 host controller driver initialization.
I followed the instruction in Documentation/trace/events.txt:"In order to facilitate early boot debugging, use boot option: trace_event=[event-list] where event-list is a comma separated list of events." and added trace_event=[xhci-hcd:xhci_dbg_init] (where xhci-hcd is the trace system and xhci_dbg_init is the trace event that i want to enable) in the boot parameters but it did not work.
More specifically, I added in /etc/grub/default: GRUB_CMDLINE_LINUX="trace_event=[xhci-hcd:xhci_dbg_init]"After updating grub, boot parameters in /boot/grub/grub.cfg were changed into: linux /boot/vmlinuz-3.9.9.130805+ root=UUID=8af1b7fc-76c1-4cab-97ef-78ef5e29e084 ro trace_event=[xhci-hcd:xhci_dbg_init] quiet radeon.audio=1
Do I miss something? Any advice would be appreciated. best regards, ksenia -- To unsubscribe from this list: send the line "unsubscribe linux-trace-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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