Re: No login prompt for the serial com port

[Jordan Uggla]

On Thu, Jul 13, 2017 at 7:12 PM, Hilbert Tu(杜睿哲_Pegatron)
<address@hidden> wrote:
> Hi Jordan,
>
> Thanks for your help.
>
> Following is the output of my system boot up parameters:
> address@hidden:~# cat /proc/cmdline
> console=ttyS1,115200 console=tty1 root=/dev/ram ramdisk_size=102400

That is very different than the kernel parameters you're passing when
using grub: root=/dev/ram0 iso-scan/filename=${isofile} console=tty1
console=ttyS1,115200n8  ramdisk_size=102400

It also appears as though you're loop booting from an iso image when
booting via grub, but not doing so when booting via uboot (no
iso-scan/filename= parameter when booted via uboot), which would be a
significant difference as well.

Try loading exactly the same kernel and initramfs, with exactly the
same kernel parameters ( console=ttyS1,115200 console=tty1
root=/dev/ram ramdisk_size=102400 ) using grub and I expect it will
boot the same way it does with uboot.

-- 
Jordan Uggla (Jordan_U on irc.freenode.net)