README.booting.md: Update and add notes

Remove mention of 'u-boot-dtb.img' which is no longer generated.

Add a small paragraph directing users to look at the Yocto dev manual
for information about generating partitioned/disk images with wic.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/README.booting.md b/README.booting.md
index f1ff39d5..04c32c51 100644
--- a/README.booting.md
+++ b/README.booting.md
@@ -142,12 +142,17 @@ It is recommended that the first partition be at least 64MB in size, however
 this value will depend on whether using a ramdisk for the root filesystem and
 how large the ramdisk is.
 
+This section describes how to manually prepare and populate an SD card image.
+There are automation tools in OpenEmbedded that can generate disk images already
+formatted and prepared such that they can be written directly to a disk. Refer
+to the Yocto Project Development Manual for more details:
+        http://www.yoctoproject.org/docs/current/dev-manual/dev-manual.html#creating-partitioned-images
+
 ### Installing U-Boot
 Add the following files to the first partition:
 
 * `boot.bin`
-* `u-boot.img` (if using u-boot-xlnx)
-* `u-boot-dtb.img` (if using u-boot)
+* `u-boot.img`
 
 ### Installing Kernel and Device Tree
 Add the following files to the first partition: