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bootstd: Support automatically setting Linux parameters

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Some Linux parameters can be set automatically by U-Boot, if it knows the
device being used. For example, since U-Boot knows the serial console
being used, it can add parameters for earlycon and console.

Add support for this.

Note that this is an experimental feature and we will see how useful it
turns out to be. It is very handy for ChromeOS, since otherwise it is very
difficult to manually determine the UART address or port number,
particularly in a script.

Provide an example of how this is used with ChromeOS.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2023-07-12 09:04:42 -06:00
committed by Bin Meng
parent 63b7ccbf9f
commit 33ebcb4681
4 changed files with 123 additions and 2 deletions
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5
cmd/bootflow.c
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@@ -474,6 +474,9 @@ static int do_bootflow_cmdline(struct cmd_tbl *cmdtp, int flag, int argc,
if (ret >= 0)
printf("%.*s\n", ret, val);
break;
case 'a': /* auto */
ret = bootflow_cmdline_auto(bflow, arg);
break;
}
switch (ret) {
case -E2BIG:
@@ -508,7 +511,7 @@ static char bootflow_help_text[] =
"bootflow info [-d] - show info on current bootflow (-d dump bootflow)\n"
"bootflow boot - boot current bootflow (or first available if none selected)\n"
"bootflow menu [-t] - show a menu of available bootflows\n"
"bootflow cmdline [set|get|clear|delete] <param> [<value>] - update cmdline";
"bootflow cmdline [set|get|clear|delete|auto] <param> [<value>] - update cmdline";
#else
"scan - boot first available bootflow\n";
#endif