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AM4372: CONFIG_SYS_CONFIG_NAME is overwritten to am437xx_evm

Part Number: AM4372

As the title says, 

my am43xx_hmi_min_defconfig:

CONFIG_TARGET=AM43XX_HMI_MIN=y

I run 

ARCH=arm CROSS_COMPILE='arm-linux-gnueabihf-' am43xx_hmi_min_defconfig

and in

.config 

CONFIG_SYS_VENDOR="ti"
CONFIG_SYS_BOARD="am43xx"
CONFIG_SYS_CONFIG_NAME="am43xx_evm"

contents of 

/board/mycompany/hmi_min:

if TARGET_AM43XX_HMI_MIN

config SYS_BOARD
default "hmi-min"

config SYS_VENDOR
default "mycompany"

config SYS_SOC
default "am33xx"

config SYS_CONFIG_NAME
default "am43xx_hmi_min"

source "board/mycompany/Kconfig"

endif

I notice that when I compile board/ti gets built not board/mycompany

also:

added my directory to arch/arm/mach-omap2/Kconifg

I have been through Board_Port/Y-Boot.html pretty carefully

Can anyone point to what I missed?