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* Patch by Seb James, 30 Jun 2003:
Improve documentation of I2C configuration in README * Fix problems with previous log buffer "fixes" * Fix minor help text issues * "log append" did not append a newline
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5 changed files with 75 additions and 23 deletions
13
CHANGELOG
13
CHANGELOG
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@ -1,3 +1,16 @@
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======================================================================
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Changes for U-Boot 0.4.2:
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======================================================================
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* Patch by Seb James, 30 Jun 2003:
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Improve documentation of I2C configuration in README
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* Fix problems with previous log buffer "fixes"
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* Fix minor help text issues
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* "log append" did not append a newline
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======================================================================
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Changes for U-Boot 0.4.1:
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======================================================================
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63
README
63
README
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@ -653,6 +653,9 @@ The following options need to be configured:
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CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
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CONFIG_RTC_DS164x - use Dallas DS164x RTC
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Note that if the RTC uses I2C, then the I2C interface
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must also be configured. See I2C Support, below.
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- Timestamp Support:
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When CONFIG_TIMESTAMP is selected, the timestamp
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@ -904,29 +907,48 @@ The following options need to be configured:
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- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
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Enables I2C serial bus commands. If this is selected,
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either CONFIG_HARD_I2C or CONFIG_SOFT_I2C must be defined
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to include the appropriate I2C driver.
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These enable I2C serial bus commands. Defining either of
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(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
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include the appropriate I2C driver for the selected cpu.
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See also: common/cmd_i2c.c for a description of the
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This will allow you to use i2c commands at the u-boot
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command line (as long as you set CFG_CMD_I2C in
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CONFIG_COMMANDS) and communicate with i2c based realtime
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clock chips. See common/cmd_i2c.c for a description of the
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command line interface.
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CONFIG_HARD_I2C selects the CPM hardware driver for I2C.
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CONFIG_HARD_I2C
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CONFIG_SOFT_I2C configures u-boot to use a software (aka
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bit-banging) driver instead of CPM or similar hardware
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support for I2C.
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Selects the CPM hardware driver for I2C.
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There are several other quantities that must also be
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defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
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CONFIG_SOFT_I2C
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In both cases you will need to define CFG_I2C_SPEED
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to be the frequency (in Hz) at which you wish your i2c bus
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to run and CFG_I2C_SLAVE to be the address of this node (ie
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the cpu's i2c node address).
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Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
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sets the cpu up as a master node and so its address should
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therefore be cleared to 0 (See, eg, MPC823e User's Manual
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p.16-473). So, set CFG_I2C_SLAVE to 0.
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Use software (aka bit-banging) driver instead of CPM
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or similar hardware support for I2C. This is configured
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via the following defines.
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That's all that's required for CONFIG_HARD_I2C.
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If you use the software i2c interface (CONFIG_SOFT_I2C)
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then the following macros need to be defined (examples are
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from include/configs/lwmon.h):
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I2C_INIT
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(Optional). Any commands necessary to enable I2C
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(Optional). Any commands necessary to enable the I2C
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controller or configure ports.
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eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
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I2C_PORT
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(Only for MPC8260 CPU). The I/O port to use (the code
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@ -939,32 +961,49 @@ The following options need to be configured:
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(driven). If the data line is open collector, this
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define can be null.
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eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
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I2C_TRISTATE
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The code necessary to make the I2C data line tri-stated
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(inactive). If the data line is open collector, this
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define can be null.
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eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
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I2C_READ
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Code that returns TRUE if the I2C data line is high,
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FALSE if it is low.
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eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
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I2C_SDA(bit)
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If <bit> is TRUE, sets the I2C data line high. If it
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is FALSE, it clears it (low).
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eg: #define I2C_SDA(bit) \
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if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
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else immr->im_cpm.cp_pbdat &= ~PB_SDA
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I2C_SCL(bit)
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If <bit> is TRUE, sets the I2C clock line high. If it
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is FALSE, it clears it (low).
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eg: #define I2C_SCL(bit) \
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if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
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else immr->im_cpm.cp_pbdat &= ~PB_SCL
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I2C_DELAY
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This delay is invoked four times per clock cycle so this
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controls the rate of data transfer. The data rate thus
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is 1 / (I2C_DELAY * 4).
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is 1 / (I2C_DELAY * 4). Often defined to be something
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like:
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#define I2C_DELAY udelay(2)
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CFG_I2C_INIT_BOARD
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@ -1,6 +1,6 @@
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/*
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* (C) Copyright 2002
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* Dtlev Zundel, DENX Software Engineering, dzu@denx.de.
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* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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@ -74,22 +74,26 @@ static unsigned long *ext_logged_chars;
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void logbuff_init_ptrs (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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unsigned long *ext_tag;
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char *s;
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log_buf = (unsigned char *)(gd->bd->bi_memsize-LOGBUFF_LEN);
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ext_log_start = (unsigned long *)(log_buf)-3;
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ext_tag = (unsigned long *)(log_buf)-4;
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ext_log_start = (unsigned long *)(log_buf)-3;
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ext_log_size = (unsigned long *)(log_buf)-2;
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ext_logged_chars = (unsigned long *)(log_buf)-1;
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#ifdef CONFIG_POST
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/* The post routines have setup the word so we can simply test it */
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if (post_word_load () & POST_POWERON) {
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if ((post_word_load () & 0xffff) == POST_POWERON) {
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logged_chars = log_size = log_start = 0;
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*ext_tag = LOGBUFF_MAGIC;
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}
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#else
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/* No post routines, so we do our own checking */
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if (post_word_load () != LOGBUFF_MAGIC) {
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logged_chars = log_size = log_start = 0;
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post_word_store (LOGBUFF_MAGIC);
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*ext_tag = LOGBUFF_MAGIC;
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}
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#endif
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/* Initialize default loglevel if present */
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@ -162,12 +166,8 @@ int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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if (strcmp(argv[1],"append") == 0) {
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/* Log concatenation of all arguments separated by spaces */
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for (i=2; i<argc; i++) {
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if (i<argc-1) {
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logbuff_printk (argv[i]);
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logbuff_putc (' ');
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} else {
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logbuff_puts (argv[i]);
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}
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logbuff_printk (argv[i]);
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logbuff_putc ((i<argc-1) ? ' ' : '\n');
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}
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return 0;
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}
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@ -205,7 +205,7 @@ int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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cmd_tbl_t U_BOOT_CMD(LOG) = MK_CMD_ENTRY(
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"log", 255, 1, do_log,
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"log - manipulate logbuffer\n",
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"log info - show pointer details\n"
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"info - show pointer details\n"
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"log reset - clear contents\n"
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"log show - show contents\n"
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"log append <msg> - append <msg> to the logbuffer\n"
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@ -24,6 +24,6 @@
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#ifndef __VERSION_H__
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#define __VERSION_H__
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#define U_BOOT_VERSION "U-Boot 0.4.1"
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#define U_BOOT_VERSION "U-Boot 0.4.2"
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#endif /* __VERSION_H__ */
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