请问有谁知道XAM335x和AM335x的区别是什么？

XAM335x是工程样片，是提供给早期客户做评估的，我建议你还是查查虚焊什么的硬件问题吧
                                                                         如果我的回答解决了您的问题，请确认答案，谢谢！：）

谢谢您的回答，我知道XAM335x是工程样片，那么请问xAM335x与AM335x都一样吧，我昨天从TI官网下载了最新的关于linux的软件资源，我看是十一月份刚更新的，烧进去结果是一样的。请问xam335x与am335x一样吗？？？如果一样的话就是硬件问题了，

是一样的，AM335x是正式发布的产品
                                                                         如果我的回答解决了您的问题，请确认答案，谢谢！：）

谢谢，也就是说XAM335x的系统移植到AM335x上是没有问题的。

是的
                                                                         如果我的回答解决了您的问题，请确认答案，谢谢！：）

liu,
这个问题解决了么？看log是没有成功的从SD卡启动，有没有尝试过串口启动？

试过串口，拨码开关设置的是00001，按着网页上的来的，可是下载u-boot-spl.bin和u-boot.img下载不进去，下载进去应该输出这些资料的信息，可是我的下载完只会出CCC，等了好久也是这样，我试过超级终端、Tera Term，而且是按着网页上说的版本，这些是没有问题的。

需要修改u-boot 源代码中/board/ti/am335x/evm.c中的spl_board_init()函数和board_init()函数，去掉对eeprom的依赖性。

您好，按着你上午的提示，在board/ti/am335x中修改evm.c，去掉spl_board_init中的if判断如下：
void spl_board_init(void)
[
uchar pmic_status_reg;
/* init board_id, configure muxes */
board_init();
//if (!strncmp("A335BONE", header.name, 8))
if(0) [
/* BeagleBone PMIC Code */
if (i2c_probe(TPS65217_CHIP_PM))
return;
if (tps65217_reg_read(STATUS, &pmic_status_reg))
return;
/* Increase USB current limit to 1300mA */
if (tps65217_reg_write(PROT_LEVEL_NONE, POWER_PATH,
USB_INPUT_CUR_LIMIT_1300MA,
USB_INPUT_CUR_LIMIT_MASK))
printf("tps65217_reg_write failuren");
/* Only perform PMIC configurations if board rev > A1 */
if (!strncmp(header.version, "00A1", 4))
return;
/* Set DCDC2 (MPU) voltage to 1.275V */
if (tps65217_voltage_update(DEFDCDC2,
DCDC_VOLT_SEL_1275MV)) [
printf("tps65217_voltage_update failuren");
return;
]
/* Set LDO3, LDO4 output voltage to 3.3V */
if (tps65217_reg_write(PROT_LEVEL_2, DEFLS1,
LDO_VOLTAGE_OUT_3_3, LDO_MASK))
printf("tps65217_reg_write failuren");
if (tps65217_reg_write(PROT_LEVEL_2, DEFLS2,
LDO_VOLTAGE_OUT_3_3, LDO_MASK))
printf("tps65217_reg_write failuren");
if (!(pmic_status_reg & PWR_SRC_AC_BITMASK)) [
printf("No AC power, disabling frequency switchn");
return;
]
/* Set MPU Frequency to 720MHz */
mpu_pll_config(MPUPLL_M_720);
] 
else 
[
uchar buf[4];
/*
* EVM PMIC code. All boards currently want an MPU voltage
* of 1.2625V and CORE voltage of 1.1375V to operate at
* 720MHz.
*/
if (i2c_probe(PMIC_CTRL_I2C_ADDR))
return;
/* VDD1/2 voltage selection register access by control i/f */
if (i2c_read(PMIC_CTRL_I2C_ADDR, PMIC_DEVCTRL_REG, 1, buf, 1))
return;
buf[0] |= PMIC_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C;
if (i2c_write(PMIC_CTRL_I2C_ADDR, PMIC_DEVCTRL_REG, 1, buf, 1))
return;
if (!voltage_update(MPU, PMIC_OP_REG_SEL_1_2_6) &&
!voltage_update(CORE, PMIC_OP_REG_SEL_1_1_3))
/* Frequency switching for OPP 120 */
mpu_pll_config(MPUPLL_M_720);
]
]
#endif
试了试不行，又修改board_init如下：
int board_init(void)
[
/* Configure the i2c0 pin mux */
enable_i2c0_pin_mux();
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
if (read_eeprom())
goto err_out;
detect_daughter_board();
//if (!strncmp("SKU#01", header.config, 6)) [
// board_id = GP_BOARD;
// detect_daughter_board_profile();
//] else if (!strncmp("SKU#02", header.config, 6)) [
// board_id = IA_BOARD;
// detect_daughter_board_profile();
//] else if (!strncmp("SKU#03", header.config, 6)) [
// board_id = IPP_BOARD;
//] else if (!strncmp("A335BONE", header.name, 8)) [
// board_id = BONE_BOARD;
// profile = 1; /* profile 0 is internally considered as 1 */
// daughter_board_connected = 0;
//] else if (!strncmp("A335X_SK", header.name, 8)) [
// board_id = SK_BOARD;
// profile = 1; /* profile 0 is internally considered as 1 */
// daughter_board_connected = 0;
//] else [
// printf("Did not find a recognized configuration, "
// "assuming General purpose EVM in Profile 0 with "
// "Daughter boardn");
board_id = GP_BOARD;
profile = 1; /* profile 0 is internally considered as 1 */
daughter_board_connected = 1;
//]
configure_evm_pin_mux(board_id, header.version, profile, daughter_board_connected);
还是不行，那块XAM3359的板子在这两种情况都可以启动，但是AM3359的板子还是启动不了，
只输出：
U-Boot SPL 2011.09 (Jan 23 2013 - 12:50:30)
Texas Instruments Revision detection unimplemented
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
read_eeprom() failure. continuing with ddr3
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.

你在这段代码附近的位置加打印信息定位一下，或者用仿真器跟踪下

您好，我在附近的位置加可写打印信息，这些信息都可以正常输出：
U-Boot SPL 2011.09 (Jan 24 2013 - 13:32:15)
Texas Instruments Revision detection unimplemented
LL:FUNC:i2c_init@evm.cLine:714
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
read_eeprom() failure. continuing with ddr3
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
LL:FUNC:board_init@evm.cLine:859
LL:FUNC:spl_board_init@evm.c,Line:631
LL:FUNC:spl_board_init@evm.cLine:640
LL:FUNC:spl_board_init@evm.cLine:644
LL:FUNC:spl_board_init@evm.cLine:649
LL:FUNC:spl_board_init@evm.cLine:655
MP S/
M: 0
有时是输出这种：
U-Boot SPL 2011.09 (Jan 24 2013 - 13:32:15)
Texas Instruments Revision detection unimplemented
LL:FUNC:i2c_init@evm.cLine:714
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
read_eeprom() failure. continuing with ddr3
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
LL:FUNC:board_init@evm.cLine:859
LL:FUNC:spl_board_init@evm.c,Line:631
LL:FUNC:spl_board_init@evm.cLine:640
LL:FUNC:spl_board_init@evm.cLine:644
LL:FUNC:spl_board_init@evm.cLine:649
LL:FUNC:spl_board_init@evm.cLine:655
MP S/
M: 0
mmc_init_setup: timedout waiting for cc2!
spl: mmc init failed: err - -19
### ERROR ### Please RESET the board ###

如果没有用到I2C，就把I2C相关的代码都关掉，试一下

我添加的信息如下：
void spl_board_init(void)
[
uchar pmic_status_reg;
/* init board_id, configure muxes */
board_init();
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//585
//if (!strncmp("A335BONE", header.name, 8))
if(0) [
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//588
/* BeagleBone PMIC Code */
if (i2c_probe(TPS65217_CHIP_PM))
return;
if (tps65217_reg_read(STATUS, &pmic_status_reg))
return;
/* Increase USB current limit to 1300mA */
if (tps65217_reg_write(PROT_LEVEL_NONE, POWER_PATH,
USB_INPUT_CUR_LIMIT_1300MA,
USB_INPUT_CUR_LIMIT_MASK))
printf("tps65217_reg_write failuren");
/* Only perform PMIC configurations if board rev > A1 */
if (!strncmp(header.version, "00A1", 4))
return;
/* Set DCDC2 (MPU) voltage to 1.275V */
if (tps65217_voltage_update(DEFDCDC2,
DCDC_VOLT_SEL_1275MV)) [
printf("tps65217_voltage_update failuren");
return;
]
/* Set LDO3, LDO4 output voltage to 3.3V */
if (tps65217_reg_write(PROT_LEVEL_2, DEFLS1,
LDO_VOLTAGE_OUT_3_3, LDO_MASK))
printf("tps65217_reg_write failuren");
if (tps65217_reg_write(PROT_LEVEL_2, DEFLS2,
LDO_VOLTAGE_OUT_3_3, LDO_MASK))
printf("tps65217_reg_write failuren");
if (!(pmic_status_reg & PWR_SRC_AC_BITMASK)) [
printf("No AC power, disabling frequency switchn");
return;
]
/* Set MPU Frequency to 720MHz */
mpu_pll_config(MPUPLL_M_720);
]
else
[
printk("LL:FUNC:spl_board_init@evm.c,Line:%dn",__LINE__);//632
uchar buf[4];
/*
* EVM PMIC code. All boards currently want an MPU voltage
* of 1.2625V and CORE voltage of 1.1375V to operate at
* 720MHz.
*/
if (i2c_probe(PMIC_CTRL_I2C_ADDR))
return;
printk("LL:FUNC:spl_board_init@evm.cLine:%dn",__LINE__);//641
/* VDD1/2 voltage selection register access by control i/f */
if (i2c_read(PMIC_CTRL_I2C_ADDR, PMIC_DEVCTRL_REG, 1, buf, 1))
return;
printk("LL:FUNC:spl_board_init@evm.cLine:%dn",__LINE__);//645
buf[0] |= PMIC_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C;
if (i2c_write(PMIC_CTRL_I2C_ADDR, PMIC_DEVCTRL_REG, 1, buf, 1))
return;
printk("LL:FUNC:spl_board_init@evm.cLine:%dn",__LINE__);//650
if (!voltage_update(MPU, PMIC_OP_REG_SEL_1_2_6) &&
!voltage_update(CORE, PMIC_OP_REG_SEL_1_1_3))
/* Frequency switching for OPP 120 */
mpu_pll_config(MPUPLL_M_720);
]
printk("LL:FUNC:spl_board_init@evm.cLine:%dn",__LINE__);//656
]
#endif
board_init函数修改如下：
int board_init(void)
[
/* Configure the i2c0 pin mux */
enable_i2c0_pin_mux();
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//808
if (read_eeprom())
goto err_out;
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//811
detect_daughter_board();
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//813
//if (!strncmp("SKU#01", header.config, 6)) [
// board_id = GP_BOARD;
// detect_daughter_board_profile();
//] else if (!strncmp("SKU#02", header.config, 6)) [
// board_id = IA_BOARD;
// detect_daughter_board_profile();
//] else if (!strncmp("SKU#03", header.config, 6)) [
// board_id = IPP_BOARD;
//] else if (!strncmp("A335BONE", header.name, 8)) [
// board_id = BONE_BOARD;
// profile = 1; /* profile 0 is internally considered as 1 */
// daughter_board_connected = 0;
//] else if (!strncmp("A335X_SK", header.name, 8)) [
// board_id = SK_BOARD;
// profile = 1; /* profile 0 is internally considered as 1 */
// daughter_board_connected = 0;
//] else [
// printf("Did not find a recognized configuration, "
// "assuming General purpose EVM in Profile 0 with "
// "Daughter boardn");
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//834
board_id = GP_BOARD;
profile = 1; /* profile 0 is internally considered as 1 */
daughter_board_connected = 1;
//]
configure_evm_pin_mux(board_id, header.version, profile, daughter_board_connected);
#ifndef CONFIG_SPL_BUILD
board_evm_init();
printk("LL:FUNC:board_evm_init@evm.cLine:%dn",__LINE__);//844
#endif
gpmc_init();
return 0;
err_out:
/*
* When we cannot use the EEPROM to determine what board we
* are we assume BeagleBone currently as we have not yet
* programmed the EEPROMs.
*/
board_id = BONE_BOARD;
profile = 1; /* profile 0 is internally considered as 1 */
daughter_board_connected = 1;
configure_evm_pin_mux(board_id, header.version, profile, daughter_board_connected);
printk("LL:FUNC:board_init@evm.cLine:%dn",__LINE__);//861
#ifndef CONFIG_SPL_BUILD
board_evm_init();
#endif

我看输出信息有mmc_init，就在board_mmc_init加输出信息，可是均没有输出：
#ifdef CONFIG_GENERIC_MMC
int board_mmc_init(bd_t *bis)
[
omap_mmc_init(0);
printk("LL:FUNC:board_mmc_init@evm.cLine:%dn",__LINE__);//1177
omap_mmc_init(1);
printk("LL:FUNC:board_mmc_init@evm.cLine:%dn",__LINE__);//1179
return 0;
]
#endif
串口输出的信息如下：
U-Boot SPL 2011.09 (Jan 24 2013 - 14:09:43)
Texas Instruments Revision detection unimplemented
LL:FUNC:i2c_init@evm.cLine:715
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
read_eeprom() failure. continuing with ddr3
LL:FUNC:board_init@evm.cLine:808
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
LL:FUNC:board_init@evm.cLine:861
LL:FUNC:board_init@evm.cLine:585
LL:FUNC:spl_board_init@evm.c,Line:632
LL:FUNC:spl_board_init@evm.cLine:641
LL:FUNC:spl_board_init@evm.cLine:645
LL:FUNC:spl_board_init@evm.cLine:650
LL:FUNC:spl_board_init@evm.cLine:656
MP S/
M: 0
mmc_init_setup: timedout waiting for cc2!
spl: mmc init failed: err - -19
### ERROR ### Please RESET the board ###

您好，我不知道evm.c中的board_mmc_init是怎么一回事，我把它改成
//#ifdef CONFIG_GENERIC_MMC
int board_mmc_init(bd_t *bis)
[
omap_mmc_init(0);
printk("LL:FUNC:board_mmc_init@evm.cLine:%dn",__LINE__);
omap_mmc_init(1);
printk("LL:FUNC:board_mmc_init@evm.cLine:%dn",__LINE__);
return 0;
]
//#endif
希望即使没有定义也可以执行，输出我加入的这两句，可是还是没有输出，
U-Boot SPL 2011.09 (Jan 24 2013 - 14:57:38)
Texas Instruments Revision detection unimplemented
LL:FUNC:i2c_init@evm.cLine:715
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
read_eeprom() failure. continuing with ddr3
LL:FUNC:board_init@evm.cLine:808
Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
LL:FUNC:board_init@evm.cLine:861
LL:FUNC:board_init@evm.cLine:585
LL:FUNC:spl_board_init@evm.c,Line:632
LL:FUNC:spl_board_init@evm.cLine:641
LL:FUNC:spl_board_init@evm.cLine:645
LL:FUNC:spl_board_init@evm.cLine:650
LL:FUNC:spl_board_init@evm.cLine:656
OMAP SD/MMC: 0                           -------每次都会输出到这里，下面的那一句就输出了一次，
mmc_send_cmd: timedout waiting for stat!
期待您的指导，谢谢！我试试去掉I2C的，在来发贴

PMIC是用I2C控制的呢

您好，谢谢您的指导，不是软件的事，软件是兼容的，是硬件的问题，解决了，谢谢您的指导！

是硬件哪里的问题呢？

换了个AM3359芯片，就好了

你好,我们这边用到了 AM332 使用 eMMC 卡启动,也碰到了这个问题
不允许替换芯片的情况下,这个问题要如何处理呢?
TI是否有了解决方法,或者这个问题是否有定位.谢谢!