diff options
Diffstat (limited to 'sys/dev/uart/uart_dev_ns8250.c')
| -rw-r--r-- | sys/dev/uart/uart_dev_ns8250.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/dev/uart/uart_dev_ns8250.c b/sys/dev/uart/uart_dev_ns8250.c index 3cdd5ad..489be29 100644 --- a/sys/dev/uart/uart_dev_ns8250.c +++ b/sys/dev/uart/uart_dev_ns8250.c @@ -242,8 +242,14 @@ ns8250_probe(struct uart_bas *bas) val = uart_getreg(bas, REG_IIR); if (val & 0x30) return (ENXIO); + /* + * Bit 6 of the MCR (= 0x40) appears to be 1 for the Sun1699 + * chip, but otherwise doesn't seem to have a function. In + * other words, uart(4) works regardless. Ignore that bit so + * the probe succeeds. + */ val = uart_getreg(bas, REG_MCR); - if (val & 0xe0) + if (val & 0xa0) return (ENXIO); return (0); |
