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ARM: bcm2835: expand Kconfig target descriptions 

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

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Stephen Warren 2016-03-24 22:15:19 -06:00 committed by Tom Rini
parent 7233fb3143
commit 95a2ddaea5
1 changed files with 27 additions and 1 deletions
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28
arch/arm/mach-bcm283x/Kconfig
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@ -14,12 +14,38 @@ 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 also supports BCM2837-based variants such as the RPi 3
Model B, when run in 32-bit mode, provided you have configured the
VideoCore firmware to select the PL011 UART for the console by:
a) config.txt should contain dtoverlay=pi3-miniuart-bt.
b) You should run the following to tell the VC FW to process DT when
booting, and copy u-boot.bin.img (rather than u-boot.bin) to the SD
card as the kernel image:
path/to/kernel/scripts/mkknlimg --dtok u-boot.bin u-boot.bin.img
This works as of firmware.git commit 046effa13ebc "firmware:
arm_loader: emmc clock depends on core clock See:
https://github.com/raspberrypi/firmware/issues/572".
This option creates a build targetting the ARMv7/AArch32 ISA.
select ARMV7_LPAE
select BCM2836
select CPU_V7