U-Boot Bootmenu's autoboot rendering is broken

Pali Rohár pali at kernel.org
Sun May 7 23:08:45 CEST 2023

If you run bootmenu in U-Boot it will print following output:

  *** U-Boot Boot Menu ***

      Attached kernel
      Internal eMMC
      External SD card
      U-Boot boot order
      U-Boot consoleHit any key to stop autoboot: 30 Hit any key to stop autoboot: 29 Hit any key to stop autoboot: 28

It happens on both serial output and VGA video output, so it is not
related to video output driver or interpreting of ANSI sequence.

Last entry is being overwritten by "Hit any key to stop autoboot" and
then every one second is new text appended after this last entry with
updated countdown. This is broken... I run git bisect and the result is:

32bab0eae51b55898d1e2804e6614d9143840581 is the first bad commit
commit 32bab0eae51b55898d1e2804e6614d9143840581
Author: Simon Glass <sjg at chromium.org>
Date:   Fri Jan 6 08:52:26 2023 -0600

    menu: Make use of CLI character processing

    Avoid duplicating some of the escape-sequence processing here and use the
    CLI function instead.

    Signed-off-by: Simon Glass <sjg at chromium.org>

:040000 040000 62275c330c72e251d79fd3f867f8c3e44a6d8f32 3933deacc7661348a31e73822341b4b262bec382 M      cmd
:040000 040000 49ba8a914e6bd3f0438db86d290af226a1eb1272 1cce113f49b3ecbb1acf6d56fa0bc8f279cf5794 M      common
:040000 040000 021b5af8bf4e8f1226b93e63f4cd9f2e581a9659 2eb10232c77e0c4fa78677b059db3c5990c2799a M      include

Simon, could you look at this issue? It can be simple reproduced just by
calling "bootmenu" command.

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