kernels: add linux-libre-aarch64

Some System On a Chip (SOC) have 64bit ARM CPUs that are also
capable of running arm 32bit applications.

Since:
- Parabola doesn't have an aarch64 package repository yet
- The devicetree of devices using such System On a Chip
  are not compiled when using the armv7 defconfig
- Drivers or other platform support code for such hardware
  might also not be compiled in with the armv7 defconfig
- This approach has already been tested with the linux-libre-x86_64
  kenrel

It's then a good idea to add support for such devices by adding
an arrch64 kernel as the maintenance and work is minimal.

The downside is that the external kernel modules that are either
compiled against the kernel or using DKMS will not work by default.

It's however still possible to compile them by hand by using
ARCH= and CROSS_COMPILE= as it is done for this kernel, so it
should be relatively easy to add support for the non-dkms modules.

As for DKMS, someone would need to look into it to understand how
to pass it the make flags (ARCH= and CROSS_COMPILE=) that are
required to automatically build modules.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/kernels/linux-libre-arm64/0001-ARM-atags-add-support-for-Marvell-s-u-boot.patch b/kernels/linux-libre-arm64/0001-ARM-atags-add-support-for-Marvell-s-u-boot.patch
new file mode 100644
index 000000000..074903c47
--- /dev/null
+++ b/kernels/linux-libre-arm64/0001-ARM-atags-add-support-for-Marvell-s-u-boot.patch
@@ -0,0 +1,51 @@
+From 88f69b1dcdda406ba9e4c6ad51f0577623d238b1 Mon Sep 17 00:00:00 2001
+From: Willy Tarreau <w@xxxxxx>
+Date: Sun, 2 Dec 2012 19:59:28 +0100
+Subject: [PATCH 1/9] ARM: atags: add support for Marvell's u-boot
+
+Marvell uses a specific atag in its u-boot which includes among other
+information the MAC addresses for up to 4 network interfaces.
+
+Signed-off-by: Willy Tarreau <w@xxxxxx>
+---
+ arch/arm/include/uapi/asm/setup.h | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+diff --git a/arch/arm/include/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h
+index 25ceda63b284..83578c54975b 100644
+--- a/arch/arm/include/uapi/asm/setup.h
++++ b/arch/arm/include/uapi/asm/setup.h
+@@ -144,6 +144,18 @@ struct tag_memclk {
+ 	__u32 fmemclk;
+ };
+ 
++/* Marvell uboot parameters */
++#define ATAG_MV_UBOOT          0x41000403
++struct tag_mv_uboot {
++	__u32 uboot_version;
++	__u32 tclk;
++	__u32 sysclk;
++	__u32 isUsbHost;
++	__u8  macAddr[4][6];
++	__u16 mtu[4];
++	__u32 nand_ecc;
++};
++
+ struct tag {
+ 	struct tag_header hdr;
+ 	union {
+@@ -166,6 +178,11 @@ struct tag {
+ 		 * DC21285 specific
+ 		 */
+ 		struct tag_memclk	memclk;
++
++		/*
++		 * Marvell specific
++		 */
++		struct tag_mv_uboot	mv_uboot;
+ 	} u;
+ };
+ 
+-- 
+2.23.0
+