[FS#744] Soekris net48xx hangs in GRUB when booting without serial connected

[LEDE Bugs]

The following task has a new comment added:

FS#744 - Soekris net48xx hangs in GRUB when booting without serial connected
User who did this - Russell Senior (russell)

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I found the problem.  I need to turn off CONFIG_GRUB_CONSOLE:

# CONFIG_GRUB_CONSOLE is not set

Boot times (measured by power-on to first ping) are identical with or without serial attached, about 1m54s.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=744#comment2530