The branch main has been updated by imp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=d1949353e5f57678f227b0b283cb63f367174e96

commit d1949353e5f57678f227b0b283cb63f367174e96
Author:     Warner Losh <[email protected]>
AuthorDate: 2021-01-14 20:43:15 +0000
Commit:     Warner Losh <[email protected]>
CommitDate: 2021-01-15 00:47:04 +0000

    uart: Improve console specification parsing
    
    Print warning when we can't parse a console specification (this may
    not appear on the console, but will appear in dmesg).
    
    Also, accept key:value and key=value. There's no reason not to
    and it makes this more forgiving of mistakes.
    
    Reviewed by: rpokala@
    Differential Revision: https://reviews.freebsd.org/D28168
---
 sys/dev/uart/uart_subr.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/sys/dev/uart/uart_subr.c b/sys/dev/uart/uart_subr.c
index 96d7735ea0ed..e6dec58d7705 100644
--- a/sys/dev/uart/uart_subr.c
+++ b/sys/dev/uart/uart_subr.c
@@ -172,7 +172,7 @@ uart_parse_tag(const char **p)
 
 out:
        *p += 2;
-       if ((*p)[0] != ':')
+       if ((*p)[0] != ':' && (*p)[0] != '=')
                return (-1);
        (*p)++;
        return (tag);
@@ -283,25 +283,22 @@ uart_getenv(int devtype, struct uart_devinfo *di, struct 
uart_class *class)
                        di->bas.rclk = uart_parse_long(&spec);
                        break;
                default:
-                       freeenv(cp);
-                       return (EINVAL);
+                       goto inval;
                }
                if (*spec == '\0')
                        break;
-               if (*spec != ',') {
-                       freeenv(cp);
-                       return (EINVAL);
-               }
+               if (*spec != ',')
+                       goto inval;
                spec++;
        }
-       freeenv(cp);
 
        /*
         * If we still have an invalid address, the specification must be
         * missing an I/O port or memory address. We don't like that.
         */
        if (addr == ~0U)
-               return (EINVAL);
+               goto inval;
+       freeenv(cp);
 
        /*
         * Accept only the well-known baudrates. Any invalid baudrate
@@ -327,4 +324,8 @@ uart_getenv(int devtype, struct uart_devinfo *di, struct 
uart_class *class)
        error = bus_space_map(di->bas.bst, addr, uart_getrange(class), 0,
            &di->bas.bsh);
        return (error);
+inval:
+       printf("warning: bad uart specification: %s\n", cp);
+       freeenv(cp);
+       return (EINVAL);
 }
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