On 12/26/20 11:42 PM, Pali Rohár wrote:
On Saturday 26 December 2020 23:32:27 Pavel Machek wrote:
On Sat 2020-12-26 20:15:40, Pali Rohár wrote:
On Saturday 26 December 2020 20:10:10 Heinrich Schuchardt wrote:
Am 26. Dezember 2020 20:03:56 MEZ schrieb "Pali Rohár" <p...@kernel.org>:
On Saturday 26 December 2020 19:44:23 Heinrich Schuchardt wrote:
Am 26. Dezember 2020 19:02:25 MEZ schrieb "Pali Rohár"
<p...@kernel.org>:
When CTRL+C is pressed interrupt bootmenu and jump into U-Boot
console.
As the last entry in bootmenu is always U-Boot console just choose
the
last
entry when CTRL+C is pressed.
It is useful when bootmenu is part of boot process and you want to
interrupt boot process by scripts which control U-Boot (serial)
console.
Wouldn't the escape key be a better choice?
I can add also escape key. But has escape key stable ANSI sequence
which
is needed to catch? If you tell me which bytes to catch (for escape
key)
I will add it.
0x1b is Escape
Does not work. 0x1b is not escape key. It is start of the ANSI escape
sequence which matches also existing keys up and down.
Unfortunately, 0x1b _is_ escape key. That is long standing bug of
vt100 terminal.
Ok. And has xterm (or other terminals) somehow fixed it? Should we
expect that some other terminals send something different for ESC key?
Usually timeout is used for detection. 0x1b followed by delay is
escape key; 0x1b followed by [ is some other key.
Any idea how long timeout should be used for this detection?
Heinrich wrote in his patch that sequence of 0x1b 0x1b should be handled
by escape key. Does it mean that we need to handle both 0x1b+timeout and
also 0x1b+0x1b as a escape key? Or we should handle 0x1b+timeout or 0x1
followed by any non '[' character as escape key?
'man console_codes' teaches that that there are escape sequences not
starting with CSI (ESC, '[').
At 1200 baud waiting for 10 ms would be enough to differentiate between
a single key stroke an escape sequence. The 1 ms wait used in
do_conitrace() will only work at >= 19200 baud.
Anyway, this bootmenu was initially written for Nokia N900 (used on LCD
display with integrated keyboard) and this device does not have ESC key.
So I would like to have CTRL+C in bootmenu working independently of ESC
key support.
