U-Boot env. var. fdt_addr vs. fdt_addr_r

Rob, in git commit 49a3fb455890dd9d53a18573d0998edb8332fc4a (from git://git.linaro.org/boot/u-boot-linaro-stable.git), there is:

+fdt_addr=0x1000 +pxefile_addr_r=0x700000 +kernel_addr_r=0x800000 +ramdisk_addr_r=0x01000000

Why is that first line fdt_addr not fdt_addr_r; the latter appears more often in mainline U-Boot and is what's mentioned in README too.

(as background, I'm working on a change to switch Tegra to using the standard env. var. names in mainline U-Boot and was snooping on what you'd done for Highbank!)