OMAP Wireless Connectivity AM37x Troubleshooting

Troubleshooting

The following list provides problem scenarios along with their suggested solutions.

• Problem Description: Nothing is shown on the terminal when applying power to the board:

• Make sure the SD is inserted correctly (label facing up).
• Make sure that the switches are set according to the Switches Configuration section provided in the <Hardware Bringup> page.
• Make sure the serial cable is connected to the UART1/2 port and the baud rate is set to 115200n8 .

• Problem Description: No messages are seen on the terminal during the kernel boot up process:

• Make sure that in the u-boot bootargs variable the console is set to ttyO0 and not ttyS0 .

• Problem Description: u-boot tries loading the kernel but fails

• Make sure that u-boot environment variables are set correctly as shown in the <Setting u-boot environment variables> section below.
• Verify that the SD card was prepared correcly and that the "boot" partition has a "uImage" file on it.

Setting u-boot Environment Variables

The boot loader needs to know to load Linux image with the following values:

Linux kernel arguments

console=/dev/ttyO0,115200n8 (serial console name - ttyO0, baud rate - 115200n8)

root=/dev/mmcblk0p2 (root file system location - partition 2 of SD card)

rootfstype=ext3 (root file system type must be ext3)

rw rootwait (mount characteristics)

Kernel image load address is 0x82000000

The following list illustrates such setup:

OMAP3_EVM # setenv bootscript echo Running bootscript from mmc ...; source 0x82000000
OMAP3_EVM # setenv loaduimage fatload mmc 0 0x82000000 uImage
OMAP3_EVM # setenv nandboot echo Booting from nand ...; run nandargs; onenand read 0x82000000 280000 400000; bootm 0x82000000
OMAP3_EVM # setenv loadbootscript fatload mmc 0 0x82000000 boot.scr
OMAP3_EVM # setenv bootargs console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext 3 rootwait
OMAP3_EVM # setenv mmcboot echo Booting from mmc ...; bootm 0x82000000
OMAP3_EVM # setenv bootcmd if mmc init;then if run loadbootscript;then run bootscript;else if run loaduimage;then run mmcboot;else run nandboot;fi;fi; else run nandboot;fi

• Save the environment on the board's flash. The next time the board is turned on, u-boot will load Linux kernel image automatically from the SD card:

OMAP3_EVM # saveenv

• Boot the board:

OMAP3_EVM # boot

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