MYD-C335X-V4 Development Board

1. Install TFTP on Ubuntu. 

2. Please copy the kernel and file system to tftp directory under Ubuntu system, for example, copy uImage and ubi.img to the /tftpboot directory under Ubuntu system. 

3. 1) Press “Enter” to get into u-boot command mode when the board start countdown; 

2) Configure u-boot environment; 

1 set ipaddr 192.168.1.250 

2 set ethaddr 88:33:14:f6:c0:d4 

3 set serverip 192.168.1.220 

4 saveenv 

5 reset 

The above commands are used for setting IP address of the board, MAC address of the Ethernet, IP address of the Ubuntu Host server, saving variables and restart. Then use ping command to ensure the board pings through with the Host. 

1 ping 192.168.1.220 

2 Auto negotitation failed 

3 link up on port 0, speed 100, full duplex 

4 Using cpsw device 

5 host 192.168.1.220 is alive 

For above, if prompts “host xxx is alive”, it means the board has pinged through with the Host successfully. If failed, it will prompts as below: 

1 MYD_AM335X# ping 192.168.1.220 

2 Auto negotitation failed 

3 Auto negotitation failed 

4 Using cpsw device 

5 ping failed; host 192.168.1.220 is not alive

3) Acquire Address Assignment Use printenv to check u-boot environment variables 

1 printenv 

There will be some output as below: 

"updatesys=nand erase.chip;mmc rescan; fatload mmc 0 82000000 MLO;nandecc hw 2;nand write.i 82000000 0 ${filesize}; fatload mmc 0 82000000 u-boot.img;nandecc hw 2;nand write.i 82000000 80000 ${filesize}; fatload mmc 0 82000000 uImage;nandecc hw 2;nand write.i 82000000 280000 ${filesize}; fatload mmc 0 82000000 ubi.img;nandecc sw;nand write.i 82000000 780000 ${filesize};led flash all"

all The purple part indicates programming MLO; the red part indicates programming u-boot; the green part indicates programming uImage; the blue part indicates programming filesystem, the nandecc hw 2 and the nandecc sw need ECC hardware checking and software checking. 

The address assignment is as below: 

First boot address: 0x0 

RAM memory address: 0x82000000 

u-boot address: 0x80000 

kernel address: 0x280000 ubi.img 

filesystem address: 0x780000 

4) Download kernel Download kernel from PC to the board RAM 0x82000000, the length will be reminded after succeed such as Bytes transferred = 3605768 (370508 hex) 

1 2 tftp 0x82000000 uImage nandecc hw 

2 #AM335X kernel needs ecc checking or it will have error: ECC: uncorrectable. 

If executing above command, it displays “#”, it means transmitting file; if prompts “TTT…”, it means transmitting overtime, you may need to check if the board has pinged through Host successfully. Erase the content of 0x370508 byte from 0x280000 address: 

1 nand erase 0x280000 0x370508 

Write the content of RAM 0x82000000 to Flash address 0x280000, length is 0x3605768: 

1 nand write.i 0x82000000 0x280000 0x370508 

 For above 

• nand write.jffs2 program JFFS2 file system, jump over the bad block 
• nand write.i equal to nand write.jffs2 
• nand write.yaffs program yaffs2 file system, need page aligned 

Download file system from PC to the board RAM 0x82000000, the length will be prompted after downloading successfully, using hexadecimal, command is as below: 

1 tftp 0x82000000 ubi.img 

2 nandecc sw        #AM335X kernel needs ecc software checking 

Note: due to the large size of filesystem, please do not interrupt during the filesystem transmitting to avoid failure. 

Erase the content of 0x3da000 byte from 0x780000 

1 nand erase 0x780000 0x3da0000 

Write the content of RAM 0x82000000 to the FLASH 0x780000 with length 0x3da0000: 

1 nand write.i 0x82000000 0x780000 0x3da0000

Source code

The AM335x CPU has two USB signals: USB0 and USB1. MYIR's MYD-AM335X development board has total 5 USB port including the 1 USB OTG port. We have used USB Hub chip USB2514 on our board to extend USB1 to 4 channels. The USB OTG is connected to the USB0 signal. So there are total 5 USB can be used on the MYD-AM335x board.

You may don't need so 4 USB Host, you can tailor to your requirement. For example, if you only need to use one USB Host, you need only connect USB to USB1_DM and USB1_DP, plus the USB1_DRVVBUS driver that's OK. The USB1_ID is connected to GND. 

AM335x has two USB signals

AM335x USB pin list

MYD-AM335X USB OTG

MYD-AM335X USB Host

MYD-AM335X USB Host driver circuit

The MYD-AM335X board has six serial ports. But UART4 and UART5 have been reused with other functions. If sometimes you need to use all the six serial ports, we can modify the kernel.

• The UART4 is reused with CAN, we use CAN by default

• The UART5 is reused with K2/K3 button, we use K2/K3 button by default.

Note: So if you want to use UART4 and UART5, you can not use the CAN and K2/K3 button then.

Please make modifications about kernel as below:

1. Open the kernel file

$vi arch/arm/mach-omap2/board-am335xevm.c

2. Add UART4 and UART5 function definition codes if not exist.

/* Module pin mux for uart3 */
static struct pinmux_config uart3_pin_mux[] = {
        {"spi0_cs1.uart3_rxd", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLUP},
        {"ecap0_in_pwm0_out.uart3_txd", OMAP_MUX_MODE1 | AM33XX_PULL_ENBL},
        {NULL, 0},
};

/* Module pin mux for uart4 */
static struct pinmux_config uart4_pin_mux[] = {
        {"uart0_ctsn.uart4_rxd", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLUP},
        {"uart0_rtsn.uart4_txd", OMAP_MUX_MODE1 | AM33XX_PULL_ENBL},
        {NULL, 0},
};

/* Module pin mux for uart5 */
static struct pinmux_config uart5_pin_mux[] = {
        {"mii1_col.uart5_rxd", OMAP_MUX_MODE3 | AM33XX_PIN_INPUT_PULLUP},
        {"rmii1_refclk.uart5_txd", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL},
        {NULL, 0},

3. Add UART initialization code if not exist, as below in blue words.

static void uart3_init(int evm_id, int profile)
{
        printk("--------uart3_init\n");

        /* Configure Uart3*/
        setup_pin_mux(uart3_pin_mux);
        return;
}

static void uart4_init(int evm_id, int profile)
{
        printk("--------uart4_init\n");

        /* Configure Uart4*/
        setup_pin_mux(uart4_pin_mux);
        return;
}

static void uart5_init(int evm_id, int profile)
{
        printk("--------uart5_init\n");

        /* Configure Uart4*/
        setup_pin_mux(uart5_pin_mux);
        return;
}

4. Add registration for the UART4 and UART5 and comment out the CAN and keys functions as in below red codes.

 {uart1_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
        {uart2_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
        {uart3_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
        {uart4_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
        {uart5_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
//      {d_can_init,    DEV_ON_BASEBOARD, PROFILE_ALL},
//      {gpio_keys_init,  DEV_ON_BASEBOARD, PROFILE_ALL},
        {gpio_led_init,  DEV_ON_BASEBOARD, PROFILE_ALL},
        {NULL, 0, 0},

5. Re-compile the kernel and update the system.

We can remove this information through modifying linux-3.2/arch/arm/mach-omap2/omap_hwmod.c

--- linux/arch/arm/mach-omap2/omap_hwmod.c.orig    2012-06-12 16:13:11.166367276 +0200
+++ linux/arch/arm/mach-omap2/omap_hwmod.c    2012-06-12 16:15:56.319482962 +0200
@@ -781,6 +781,8 @@
                          oh->prcm.omap4.clkctrl_offs);
 }
  
+#define WD_FILTER    "wd_timer2"
+
 /**
  * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
  * @oh: struct omap_hwmod *
@@ -807,10 +809,10 @@
             oh->prcm.omap4.clkctrl_offs);
  
     v = _omap4_wait_target_disable(oh);
-    if (v)
-        pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
-                oh->name);
-
+    if (v) {
+        if (strcmp(oh->name, WD_FILTER))
+            pr_warn("omap_hwmod: %s: _wait_target_disable failed\n", oh->name);
+    }
     return 0;
 }

MYIR is using the 15x15 mm, 0.8-mm ball pitch, ZCZ package AM335x ARM CPU on the MYC-AM335X CPU Module and the main differences of the MYD-AM335X boards are from the CPU (AM3352, AM3354, AM3356, AM3357, AM3358 and AM3359) features including speed grades, packages, graphics and peripherals. Please refer to the file below:

 AM335x_Devices 

Please solve in below way:

Press space key when u-boot in the countdown, stop at the u-boot command line and input two lines of commands:

MYD_AM335X# set nand_img_siz '0x500000'
MYD_AM335X# saveenv

Other commands for reference:

MYD_AM335X# print nand_boot
MYD_AM335X# print nand_img_siz

V6 or before V6 edition of the product disk file system: /etc/init.d/rc file

Or V7 and after that edition of the product disk file system: /etc/init.d/rcS file 

LCD and USB parts, remove or comment out below code:

source code path: arch/arm/mach-omap2/board-am335xevm.c

I2C part, remove or comment out below code:

source code path: arch/arm/mach-omap2/board-am335xevm.c 

Audio part: remove or comment out below codes in kernel source code

source code path: arch/arm/mach-omap2/devices.c

HDMI and touch screen driver

remove or comment out below codes in file system:

script files: /etc/init.d/rc file or /etc/init.d/rcS file