Hi, You can add "earlycon=uart8250,mmio32,0x1c020000" to see how far the kernel boot on serial console can go. Also, make sure to say Y to CONFIG_SERIAL_8250 & relevant config in your kernel .config. Best regards, Chuong. On Fri, Mar 18, 2016 at 2:49 PM, Michael Howard <mike at dewberryfields.co.uk> wrote: > On 18/03/2016 03:18, Chuong Tran wrote: > >> Hi Gordan, >> >> If you want to retain the output on serial console, please add kernel >> command "console=ttyS0,115200" at the grub config. >> If you want to see the kernel boot at both serial and vga, add >> "console=tty0" (for vga) along side with "console=ttyS0,115200". The output >> from VGA will come after kernel configure the video card. >> >> >> I use this setting ("console=ttyS0,115200 console=tty0") but output is > not retained on the serial console. Maybe this is kernel specific. > > -- > Mike Howard > > > _______________________________________________ > Arm-dev mailing list > Arm-dev at centos.org > https://lists.centos.org/mailman/listinfo/arm-dev > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/arm-dev/attachments/20160318/6e3760a6/attachment-0006.html>