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console: Implement pre-console buffer

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Allow redirection of console output prior to console initialisation to a
temporary buffer.

To enable this functionality, the board (or arch) must define:
 - CONFIG_PRE_CONSOLE_BUFFER - Enable pre-console buffer
 - CONFIG_PRE_CON_BUF_ADDR - Base address of pre-console buffer
 - CONFIG_PRE_CON_BUF_SZ - Size of pre-console buffer (in bytes)

The pre-console buffer will buffer the last CONFIG_PRE_CON_BUF_SZ bytes
Any earlier characters are silently dropped.
This commit is contained in:
Graeme Russ 2011-09-01 00:48:27 +00:00 committed by Wolfgang Denk
parent cc9abfe4ce
commit 9558b48af0
13 changed files with 88 additions and 2 deletions
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14
README
View file

@ -619,6 +619,20 @@ The following options need to be configured:
must be defined, to setup the maximum idle timeout for
the SMC.
- Pre-Console Buffer:
Prior to the console being initialised (i.e. serial UART
initialised etc) all console output is silently discarded.
Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
buffer any console messages prior to the console being
initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
bytes are output before the console is initialised, the
earlier bytes are discarded.
'Sane' compilers will generate smaller code if
CONFIG_PRE_CON_BUF_SZ is a power of 2
- Boot Delay: CONFIG_BOOTDELAY - in seconds
Delay before automatically booting the default image;
set to -1 to disable autoboot.

3
arch/arm/include/asm/global_data.h
View file

@ -38,6 +38,9 @@ typedef struct global_data {
unsigned long flags;
unsigned long baudrate;
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long fb_base; /* base address of frame buffer */

3
arch/avr32/include/asm/global_data.h
View file

@ -38,6 +38,9 @@ typedef struct global_data {
unsigned long baudrate;
unsigned long stack_end; /* highest stack address */
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long reloc_off; /* Relocation Offset */
unsigned long env_addr; /* Address of env struct */
unsigned long env_valid; /* Checksum of env valid? */

3
arch/blackfin/include/asm/global_data.h
View file

@ -45,6 +45,9 @@ typedef struct global_data {
unsigned long board_type;
unsigned long baudrate;
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
phys_size_t ram_size; /* RAM size */
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */

3
arch/m68k/include/asm/global_data.h
View file

@ -57,6 +57,9 @@ typedef struct global_data {
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
#if defined(CONFIG_LCD) || defined(CONFIG_VIDEO)
unsigned long fb_base; /* Base addr of framebuffer memory */
#endif

3
arch/microblaze/include/asm/global_data.h
View file

@ -39,6 +39,9 @@ typedef struct global_data {
unsigned long flags;
unsigned long baudrate;
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long fb_base; /* base address of frame buffer */

3
arch/mips/include/asm/global_data.h
View file

@ -41,6 +41,9 @@ typedef struct global_data {
unsigned long flags;
unsigned long baudrate;
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
phys_size_t ram_size; /* RAM size */
unsigned long reloc_off; /* Relocation Offset */
unsigned long env_addr; /* Address of Environment struct */

3
arch/nios2/include/asm/global_data.h
View file

@ -29,6 +29,9 @@ typedef struct global_data {
unsigned long baudrate;
unsigned long cpu_clk; /* CPU clock in Hz! */
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
phys_size_t ram_size; /* RAM size */
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid */

3
arch/powerpc/include/asm/global_data.h
View file

@ -138,6 +138,9 @@ typedef struct global_data {
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
#if defined(CONFIG_SYS_ALLOC_DPRAM) || defined(CONFIG_CPM2)
unsigned int dp_alloc_base;
unsigned int dp_alloc_top;

3
arch/sh/include/asm/global_data.h
View file

@ -34,6 +34,9 @@ typedef struct global_data
unsigned long baudrate;
unsigned long cpu_clk; /* CPU clock in Hz! */
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
phys_size_t ram_size; /* RAM size */
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid */

3
arch/sparc/include/asm/global_data.h
View file

@ -53,6 +53,9 @@ typedef struct global_data {
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
#if defined(CONFIG_LCD) || defined(CONFIG_VIDEO)
unsigned long fb_base; /* Base address of framebuffer memory */
#endif

3
arch/x86/include/asm/global_data.h
View file

@ -40,6 +40,9 @@ typedef struct global_data {
unsigned long flags;
unsigned long baudrate;
unsigned long have_console; /* serial_init() was called */
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long reloc_off; /* Relocation Offset */
unsigned long load_off; /* Load Offset */
unsigned long env_addr; /* Address of Environment struct */

43
common/console.c
View file

@ -329,6 +329,39 @@ int tstc(void)
return serial_tstc();
}
#ifdef CONFIG_PRE_CONSOLE_BUFFER
#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)
{
while (*s)
pre_console_putc(*s++);
}
static void print_pre_console_buffer(void)
{
unsigned long i = 0;
char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
if (gd->precon_buf_idx > CONFIG_PRE_CON_BUF_SZ)
i = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;
while (i < gd->precon_buf_idx)
putc(buffer[CIRC_BUF_IDX(i++)]);
}
#else
static inline void pre_console_putc(const char c) {}
static inline void pre_console_puts(const char *s) {}
static inline void print_pre_console_buffer(void) {}
#endif
void putc(const char c)
{
#ifdef CONFIG_SILENT_CONSOLE
@ -342,7 +375,7 @@ void putc(const char c)
#endif
if (!gd->have_console)
return;
return pre_console_putc(c);
if (gd->flags & GD_FLG_DEVINIT) {
/* Send to the standard output */
@ -366,7 +399,7 @@ void puts(const char *s)
#endif
if (!gd->have_console)
return;
return pre_console_puts(s);
if (gd->flags & GD_FLG_DEVINIT) {
/* Send to the standard output */
@ -383,8 +416,10 @@ int printf(const char *fmt, ...)
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
#ifndef CONFIG_PRE_CONSOLE_BUFFER
if (!gd->have_console)
return 0;
#endif
va_start(args, fmt);
@ -404,8 +439,10 @@ int vprintf(const char *fmt, va_list args)
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
#ifndef CONFIG_PRE_CONSOLE_BUFFER
if (!gd->have_console)
return 0;
#endif
/* For this to work, printbuffer must be larger than
* anything we ever want to print.
@ -547,6 +584,8 @@ int console_init_f(void)
gd->flags |= GD_FLG_SILENT;
#endif
print_pre_console_buffer();
return 0;
}