wic: sdimage-2part-efi: Add variable for adding bootloader options

We have a need for some platforms to add kernel options to the bootloader
during wic creation time.  Create a new variable and add that to the
sdimage-2part-efi.wks.in file so that a machine can override it if
needed.

Add an override for am64 to point the kernel at console=ttyS2.

Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/conf/machine/include/am64xx.inc

@@ -34,3 +34,5 @@ TFA_BOARD = "lite"
 OPTEEMACHINE = "k3-am64x"
 
 MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "prueth-fw pruhsr-fw prusw-fw"
+
+TI_WKS_BOOTLOADER_APPEND="console=ttyS2,115200n8"

meta-ti-bsp/conf/machine/include/k3.inc

@@ -50,6 +50,8 @@ MACHINE_FEATURES += "efi"
 
 WKS_FILE ?= "${@bb.utils.contains("MACHINE_FEATURES", "efi", "sdimage-2part-efi.wks.in", "sdimage-2part.wks", d)}"
 
+TI_WKS_BOOTLOADER_APPEND ?= ""
+
 do_image_wic[depends] += "virtual/bootloader:do_deploy"
 
 SERIAL_CONSOLES = "115200;ttyS0 115200;ttyS2"

meta-ti-bsp/wic/sdimage-2part-efi.wks.in

@@ -3,6 +3,6 @@
 # supports EFI.  Boot files are located in the first vfat partition with extra
 # reserved space.  We cannot use a GPT here.
 
-bootloader --timeout=3 --append="rootfstype=ext4"
+bootloader --timeout=3 --append="rootfstype=ext4 ${TI_WKS_BOOTLOADER_APPEND}"
 part --source bootimg-efi --sourceparams="loader=${EFI_PROVIDER}" --fstype=vfat --label boot --active --align 1024 --use-uuid --fixed-size 128M
 part / --source rootfs --fstype=ext4 --label root --align 1024 --use-uuid