[lDebug] Boot load protocol command with empty command line emits a spurious letter

Title	[lDebug] Boot load protocol command with empty command line emits a spurious letter
Author	E. C. Masloch
Created	2026-06-06 17:46:57 +0200 Jun Sat
State	closed

After running a boot protocol command with a nonempty kernel command line, running a second boot protocol command with an empty command line will emit a spurious text byte into the command line buffer.

E. C. Masloch on 2026-06-06 17:49:31 +0200 Jun Sat

This problem was caused by a stale byte [load_cmdline_first] in case of an empty (absent) command line. It is fixed by resetting this variable, in hg 6dff20dd8bae on 2026-01-14.