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| author | Stefan Agner <stefan@agner.ch> | 2015-05-20 00:03:52 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2015-05-20 23:10:14 +0200 |
| commit | 8064887e02fd684fa0576cbbcdbc29ceab125c4c (patch) | |
| tree | 88f802d85811ff7e6c71832646de535e9bd5f954 /Documentation | |
| parent | ARM: introduce ARM_SINGLE_ARMV7M for ARMv7-M platforms (diff) | |
| download | linux-8064887e02fd684fa0576cbbcdbc29ceab125c4c.tar.xz linux-8064887e02fd684fa0576cbbcdbc29ceab125c4c.zip | |
ARM: vf610: enable Cortex-M4 configuration on Vybrid SoC
This patch allows to build the Kernel for Vybrid (VF6xx) SoC
when ARMv7-M CPU is selected. The resulting image runs on the
secondary Cortex-M4 core. This core has equally access to all
peripherals as the main Cortex-A5 core. However, there is no
resource control mechanism, hence when both cores are used
simultaneously, orthogonal device tree's are required.
The boot CPU is dependent on the SoC variant. The available
boards use mostly variants where the Cortex-A5 is the primary
and hence the boot CPU. Booting the secondary Cortex-M4 CPU
needs SoC specific registers written. There is no in kernel
support for this right now, a external userspace utility
called "m4boot" can be used to boot the kernel:
m4boot xipImage initramfs.cpio.lzo vf610m4-colibri.dtb
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/arm/fsl.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/fsl.txt b/Documentation/devicetree/bindings/arm/fsl.txt index a5462b6b3c30..2a3ba73f0c5c 100644 --- a/Documentation/devicetree/bindings/arm/fsl.txt +++ b/Documentation/devicetree/bindings/arm/fsl.txt @@ -81,12 +81,15 @@ Freescale Vybrid Platform Device Tree Bindings For the Vybrid SoC familiy all variants with DDR controller are supported, which is the VF5xx and VF6xx series. Out of historical reasons, in most places the kernel uses vf610 to refer to the whole familiy. +The compatible string "fsl,vf610m4" is used for the secondary Cortex-M4 +core support. Required root node compatible property (one of them): - compatible = "fsl,vf500"; - compatible = "fsl,vf510"; - compatible = "fsl,vf600"; - compatible = "fsl,vf610"; + - compatible = "fsl,vf610m4"; Freescale LS1021A Platform Device Tree Bindings ------------------------------------------------ |