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VAR-SOM-AM33 Linux SDK 7 Configurations

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VAR-SOM-AM33 SDK 7.0 typical configurations


1 LCD porting

Refer to:LCD porting

2 Installing Graphics SDK

Refer to: Installing Graphics SDK

3 Change u-boot default Ethernet port to Gbit Ethernet

Default ethernet port is defined in the below struct in board/ti/var-som-am33/board.c Changing the order of the definition of the ports determines the default port, when the last defined port is the default.

static struct cpsw_slave_data cpsw_slaves[] = {
	{
		.slave_reg_ofs	= 0x308,
		.sliver_reg_ofs	= 0xdc0,
		.phy_addr	= 7,
	},
	{
		.slave_reg_ofs	= 0x208, //Default u-boot port is 10/100 port
		.sliver_reg_ofs	= 0xd80,
		.phy_addr	= 0,
	},
}
;

4 Change USB-OTG port configuration to Host-only

From SW perspective, the developer should do as follows:

  • Download a VAR-SOM-AM33 kernel out-of-tree.
  • Update var-som-am33.dts, as follows:
$ gedit arch/arm/boot/dts/var-som-am33.dts
...
           usb@47401800 {
                               status = "okay";
                               dr_mode = "host"; /* <<-- Add this line */
                        };
...
  • Build var-som-am33.dtb and replace it on flash / NFS.

Once the var-som-am33.dtb has been replaced on flash / NFS - The USB-OTG port will function in Host-only mode.

5 Reference Documentation