[U-Boot] [PATCH 4/5] ARM: bcm2835: expand Kconfig target descriptions

[Stephen Warren]

This adds an explanation of which Raspberry Pi models each target option
supports.

Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
---
 arch/arm/mach-bcm283x/Kconfig | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-bcm283x/Kconfig b/arch/arm/mach-bcm283x/Kconfig
index dc6770437ec6..0790dd02d6f0 100644
--- a/arch/arm/mach-bcm283x/Kconfig
+++ b/arch/arm/mach-bcm283x/Kconfig
@@ -14,12 +14,29 @@ choice
 	optional
 
 config TARGET_RPI
-	bool "Raspberry Pi"
+	bool "Raspberry Pi (all BCM2835 variants)"
+	help
+	  Support for all ARM1176-/BCM2835-based Raspberry Pi variants, such as
+	  the A, A+, B, B+, Compute Module, and Zero. This option cannot
+	  support BCM2836/BCM2837-based Raspberry Pis such as the RPi 2 and
+	  RPi 3 due to different peripheral address maps.
+
+	  This option creates a build targetting the ARM1176 ISA.
 	select BCM2835
 	select CPU_ARM1176
 
 config TARGET_RPI_2
 	bool "Raspberry Pi 2"
+	help
+	  Support for all BCM2836-based Raspberry Pi variants, such as
+	  the RPi 2 model B.
+
+	  This option should also support BCM2837-based variants such as the
+	  RPi 3 model B, when run in 32-bit mode, provided you have configured
+	  the VideoCore firmware (via config.txt) to select the PL011 UART for
+	  the console (the default is the mini UART on the RPi 3).
+
+	  This option creates a build targetting the ARMv7/AArch32 ISA.
 	select ARMV7_LPAE
 	select BCM2836
 	select CPU_V7
-- 
2.7.3