7f505e7f79
The SCR, scratch register was not present on the 8250 and 8250B UART, so we can use to test if we actually do have serial port. We need this test because some systems will get long delays while attempting to write to non-existing port and this will slow down the console IO to extreme. MFC after: 1 week |
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|---|---|---|
| .. | ||
| Makefile | ||
| Makefile.depend | ||
| amd64_tramp.S | ||
| bio.c | ||
| biosacpi.c | ||
| biosdisk.c | ||
| biosmem.c | ||
| biospci.c | ||
| biospnp.c | ||
| biossmap.c | ||
| bootinfo.c | ||
| bootinfo32.c | ||
| bootinfo64.c | ||
| comconsole.c | ||
| devicename.c | ||
| elf32_freebsd.c | ||
| elf64_freebsd.c | ||
| i386_copy.c | ||
| i386_module.c | ||
| libi386.h | ||
| multiboot.c | ||
| multiboot.h | ||
| multiboot_tramp.S | ||
| nullconsole.c | ||
| pread.c | ||
| pxe.c | ||
| pxe.h | ||
| pxetramp.S | ||
| relocater_tramp.S | ||
| spinconsole.c | ||
| time.c | ||
| vidconsole.c | ||