On 2017-02-24 5:33 AM, Dengke Du wrote:
Hi Jussi and bruceYocto Bug#10456: X can not launch on qemumips64 I find the kernel 4.4 is ok, and on the latest 4.9 is ok, but on kernel 4.8 is failed. This is because this commit in linux-yocto-4.8: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ commit d03516df837587368fc6e75591f6329c072b9eb5 Author: Matthew Leach <matthew.le...@codethink.co.uk> Date: Tue Jun 21 16:19:49 2016 +0100 tty: serial: 8250: add CON_CONSDEV to flags When using the 8250 as a boot console and the main console results in messages being printed twice. The console framework will only unregister boot consoles if a new console is registered with the CON_CONSDEV flag set. Set this flag for the univ8250 console to prevent double-registration. Signed-off-by: Matthew Leach <matthew.le...@codethink.co.uk> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index fa823a5..dcf43f6 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -675,7 +675,7 @@ static struct console univ8250_console = { .device = uart_console_device, .setup = univ8250_console_setup, .match = univ8250_console_match, - .flags = CON_PRINTBUFFER | CON_ANYTIME, + .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_CONSDEV, .index = -1, .data = &serial8250_reg, }; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 4.9 has been reverted it, so backport that reverted patch can fix this bug, but I don't know why this related to qemumips64?
Looks like the console is interfering with X claiming a VT for startup. But I wouldn't worry about the root cause all that much, if you've bisected it, and it has been reverted already in newer kernels .. that should be enough evidence for anyone. Bruce
Thanks Dengke
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