diff options
Diffstat (limited to 'common/port80.c')
| -rw-r--r-- | common/port80.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/common/port80.c b/common/port80.c index 114f1cf520..34b418d76d 100644 --- a/common/port80.c +++ b/common/port80.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. +/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ @@ -11,28 +11,29 @@ #include "uart.h" #include "util.h" - #define HISTORY_LEN 16 static uint8_t history[HISTORY_LEN]; static int head = 0; /* Next index to use / oldest previous entry */ -static int last_data = -1; /* Last data written to port 80 */ +static int scroll = 0; void port_80_write(int data) { #ifndef CONFIG_PORT80_PRINT_DUPLICATES + static int last_data = -1; /* Last data written to port 80 */ + /* Ignore duplicate writes, since the linux kernel writes to port 80 * as a delay mechanism during boot. */ if (data == last_data) return; + + last_data = data; #endif /* TODO: post to SWI and print from there? This currently * prints from inside the LPC interrupt itself. */ - - uart_printf("[Port 80: 0x%02x]\n", data); - last_data = data; + uart_printf("%c[Port 80: 0x%02x]", scroll ? '\n' : '\r', data); history[head] = data; head = (head + 1) & (HISTORY_LEN - 1); @@ -47,10 +48,18 @@ static int command_port80(int argc, char **argv) int h = head; int i; + /* 'port80 scroll' toggles whether port 80 output begins with a newline + * (scrolling) or CR (non-scrolling). */ + if (argc > 1 && !strcasecmp(argv[1], "scroll")) { + scroll = !scroll; + uart_printf("port80 scrolling %sabled\n", + scroll ? "en" : "dis"); + return EC_SUCCESS; + } + /* Technically, if a port 80 write comes in while we're * printing this, we could print an incorrect history. * Probably not worth the complexity to work around that. */ - uart_puts("Last port 80 writes:"); for (i = 0; i < HISTORY_LEN; i++) uart_printf(" %02x", history[(h + i) & (HISTORY_LEN - 1)]); |