diff options
Diffstat (limited to 'payloads/libpayload/drivers/serial.c')
| -rw-r--r-- | payloads/libpayload/drivers/serial.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/serial.c b/payloads/libpayload/drivers/serial.c index c0200af00c..cd00a13204 100644 --- a/payloads/libpayload/drivers/serial.c +++ b/payloads/libpayload/drivers/serial.c @@ -35,6 +35,8 @@ #define MEMBASE (phys_to_virt(lib_sysinfo.serial->baseaddr)) #define DIVISOR(x) (115200 / x) +static int serial_io_hardware_is_present = 1; + #ifdef CONFIG_SERIAL_SET_SPEED static void serial_io_hardware_init(int port, int speed, int word_bits, int parity, int stop_bits) { @@ -107,6 +109,12 @@ void serial_init(void) #endif console_add_input_driver(&consin); console_add_output_driver(&consout); + + /* check to see if there's actually serial port h/w */ + if (lib_sysinfo.ser_ioport) { + if( (inb(IOBASE + 0x05)==0xFF) && (inb(IOBASE + 0x06)==0xFF) ) + serial_io_hardware_is_present = 0; + } } static void serial_io_putchar(unsigned int c) @@ -118,11 +126,15 @@ static void serial_io_putchar(unsigned int c) static int serial_io_havechar(void) { + if ( !serial_io_hardware_is_present ) + return 0; return inb(IOBASE + 0x05) & 0x01; } static int serial_io_getchar(void) { + if ( !serial_io_hardware_is_present ) + return -1; while (!serial_io_havechar()) ; return (int)inb(IOBASE); } |