diff options
Diffstat (limited to 'payloads/libpayload/drivers/serial.c')
| -rw-r--r-- | payloads/libpayload/drivers/serial.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/payloads/libpayload/drivers/serial.c b/payloads/libpayload/drivers/serial.c index a4cd6d013a..0d2964b771 100644 --- a/payloads/libpayload/drivers/serial.c +++ b/payloads/libpayload/drivers/serial.c @@ -34,7 +34,7 @@ #define IOBASE lib_sysinfo.serial->baseaddr #define MEMBASE (phys_to_virt(IOBASE)) -static int serial_hardware_is_present = 1; +static int serial_hardware_is_present = 0; static int serial_is_mem_mapped = 0; static uint8_t serial_read_reg(int offset) @@ -105,7 +105,8 @@ void serial_init(void) #ifdef CONFIG_IO_ADDRESS_SPACE if ((inb(IOBASE + 0x05) == 0xFF) && (inb(IOBASE + 0x06) == 0xFF)) { - serial_hardware_is_present = 0; + printf("IO space mapped serial not present."); + return; } #else printf("IO space mapped serial not supported."); @@ -118,12 +119,14 @@ void serial_init(void) #endif console_add_input_driver(&consin); console_add_output_driver(&consout); + serial_hardware_is_present = 1; } void serial_putchar(unsigned int c) { - if (serial_hardware_is_present) - while ((serial_read_reg(0x05) & 0x20) == 0) ; + if (!serial_hardware_is_present) + return; + while ((serial_read_reg(0x05) & 0x20) == 0) ; serial_write_reg(c, 0x00); } |