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[serial] Check for UART existence in uart_select()

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Check for existence of the UART in uart_select(), not just in
uart_init().  This allows uart_select() to refuse to set a non-working
address in uart->base, which in turns means that the serial console
code will not attempt to use a non-existent UART.

Reported-by: Torgeir Wulfsberg <Torgeir.Wulfsberg@kongsberg.com>
Reported-by: Ján ONDREJ (SAL) <ondrejj@salstar.sk>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-07-31 11:19:19 +01:00
parent 9aa55f811a
commit 2849932c48
3 changed files with 42 additions and 16 deletions
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src/include/ipxe/uart.h
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@@ -126,6 +126,7 @@ static inline uint8_t uart_receive ( struct uart *uart ) {
extern void uart_transmit ( struct uart *uart, uint8_t data );
extern void uart_flush ( struct uart *uart );
extern int uart_exists ( struct uart *uart );
extern int uart_init ( struct uart *uart, unsigned int baud, uint8_t lcr );
#endif /* _IPXE_UART_H */