[PATCH 1/3] Uartlite: Flush RX fifo in bootwrapper
From: Grant Likely <hidden>
Date: 2007-09-30 21:47:26
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Grant Likely <redacted> Flush the uartlite RX fifo so that characters typed before entry into the zImage wrapper do not muck up the kernel command line. Signed-off-by: Grant Likely <redacted> --- arch/ppc/boot/simple/misc-embedded.c | 4 +++- arch/ppc/boot/simple/uartlite_tty.c | 8 ++++++++ 2 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/arch/ppc/boot/simple/misc-embedded.c b/arch/ppc/boot/simple/misc-embedded.c
index 8a08ad3..d5a00eb 100644
--- a/arch/ppc/boot/simple/misc-embedded.c
+++ b/arch/ppc/boot/simple/misc-embedded.c@@ -89,7 +89,9 @@ load_kernel(unsigned long load_addr, int num_words, unsigned long cksum, bd_t *b * initialize the serial console port. */ embed_config(&bp); -#if defined(CONFIG_SERIAL_CPM_CONSOLE) || defined(CONFIG_SERIAL_8250_CONSOLE) +#if defined(CONFIG_SERIAL_CPM_CONSOLE) || \ + defined(CONFIG_SERIAL_8250_CONSOLE) || \ + defined(CONFIG_SERIAL_UARTLITE_CONSOLE) com_port = serial_init(0, bp); #endif
diff --git a/arch/ppc/boot/simple/uartlite_tty.c b/arch/ppc/boot/simple/uartlite_tty.c
index 0eae1ea..ca1743e 100644
--- a/arch/ppc/boot/simple/uartlite_tty.c
+++ b/arch/ppc/boot/simple/uartlite_tty.c@@ -16,6 +16,14 @@ #define UARTLITE_BASEADDR ((void*)(XPAR_UARTLITE_0_BASEADDR)) +unsigned long +serial_init(int chan, void *ignored) +{ + /* Clear the RX FIFO */ + out_be32(UARTLITE_BASEADDR + 0x0C, 0x2); + return 0; +} + void serial_putc(unsigned long com_port, unsigned char c) {