Commit 295d3942 authored by Simon Glass's avatar Simon Glass Committed by Stefano Babic
Browse files

Add board_pre_console_putc to deal with early console output

This patch adds support for console output before the console is inited.
The main purpose of this is to deal with a very early panic() which would
otherwise cause a silent hang.

A new board_pre_console_putc() function is added to the board API. If
provided by the board it will be called in the event of console output
before the console is ready. This function should turn on all UARTs and
spray the character out if it possibly can.

The feature is controlled by a new CONFIG_PRE_CONSOLE_PUTC option.
Signed-off-by: default avatarSimon Glass <>
Acked-by: default avatarGraeme Russ <>
parent c4eba6ec
......@@ -638,6 +638,23 @@ The following options need to be configured:
'Sane' compilers will generate smaller code if
CONFIG_PRE_CON_BUF_SZ is a power of 2
- Pre-console putc():
Prior to the console being initialised, console output is
normally silently discarded. This can be annoying if a
panic() happens in this time.
If the CONFIG_PRE_CONSOLE_PUTC option is defined, then
U-Boot will call board_pre_console_putc() for each output
character in this case, This function should try to output
the character if possible, perhaps on all available UARTs
(it will need to do this directly, since the console code
is not functional yet). Note that if the panic happens
early enough, then it is possible that board_init_f()
(or even arch_cpu_init() on ARM) has not been called yet.
You should init all clocks, GPIOs, etc. that are needed
to get the character out. Baud rates will need to default
to something sensible.
- Boot Delay: CONFIG_BOOTDELAY - in seconds
Delay before automatically booting the default image;
set to -1 to disable autoboot.
......@@ -329,14 +329,19 @@ int tstc(void)
return serial_tstc();
#define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)
static void pre_console_putc(const char c)
char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;
static void pre_console_puts(const char *s)
......@@ -347,6 +352,7 @@ static void pre_console_puts(const char *s)
static void print_pre_console_buffer(void)
unsigned long i = 0;
char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
......@@ -355,7 +361,9 @@ static void print_pre_console_buffer(void)
while (i < gd->precon_buf_idx)
static inline void pre_console_putc(const char c) {}
static inline void pre_console_puts(const char *s) {}
......@@ -285,6 +285,13 @@ extern ulong monitor_flash_len;
int mac_read_from_eeprom(void);
extern u8 _binary_dt_dtb_start[]; /* embedded device tree blob */
* Called when console output is requested before the console is available.
* The board should do its best to get the character out to the user any way
* it can.
void board_pre_console_putc(int ch);
/* common/flash.c */
void flash_perror (int);
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment