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loader: comconsole: don't unconditionally wipe out hw.uart.console

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It may be the case that we need to set hw.uart.console manually in some
scenarios that comconsole can't necessarily support.  Avoid clobbering
hw.uart.console unless we've actually selected comconsole so that one
could at least get kernel console output..

Discussed with:	imp
Sponsored by:	Zenith Electronics LLC
Sponsored by:	Klara, Inc.
This commit is contained in:
Kyle Evans 2023-04-13 23:41:22 -05:00
parent 26713ad9cf
commit ec671f4980
1 changed files with 2 additions and 1 deletions
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3
stand/i386/libi386/comconsole.c
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@ -338,12 +338,13 @@ comc_setup(int speed, int port)
char intbuf[64];
int tries;
unsetenv("hw.uart.console");
comc_curspeed = speed;
comc_port = port;
if ((comconsole.c_flags & (C_ACTIVEIN | C_ACTIVEOUT)) == 0)
return;
unsetenv("hw.uart.console");
#define COMC_TEST 0xbb
/*
* Write byte to scratch register and read it out.