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, 47 insertions, 0 deletions

diff --git a/kernels/linux-libre-arm64/0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch b/kernels/linux-libre-arm64/0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch
new file mode 100644
index 000000000..546120041
--- /dev/null
+++ b/kernels/linux-libre-arm64/0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch
@@ -0,0 +1,47 @@
+From cb931641740269a78b002b438904292a1110a5a7 Mon Sep 17 00:00:00 2001
+From: Willy Tarreau <w@xxxxxx>
+Date: Sun, 2 Dec 2012 19:56:58 +0100
+Subject: [PATCH 2/9] ARM: atags/fdt: retrieve MAC addresses from Marvell boot
+ loader
+
+The atags are parsed and if a Marvell atag is found, up to 4 MAC
+addresses are extracted there and assigned to node aliases eth0..3
+with the name "mac-address".
+
+This was tested on my Mirabox and the two NICs had their correct
+address set.
+
+Signed-off-by: Willy Tarreau <w@xxxxxx>
+---
+ arch/arm/boot/compressed/atags_to_fdt.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c
+index 330cd3c2eae5..82f3802ff695 100644
+--- a/arch/arm/boot/compressed/atags_to_fdt.c
++++ b/arch/arm/boot/compressed/atags_to_fdt.c
+@@ -19,7 +19,7 @@ static int node_offset(void *fdt, const char *node_path)
+ }
+ 
+ static int setprop(void *fdt, const char *node_path, const char *property,
+-		   uint32_t *val_array, int size)
++		   void *val_array, int size)
+ {
+ 	int offset = node_offset(fdt, node_path);
+ 	if (offset < 0)
+@@ -203,6 +203,12 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space)
+ 			hex_str(serno, atag->u.serialnr.high);
+ 			hex_str(serno+8, atag->u.serialnr.low);
+ 			setprop_string(fdt, "/", "serial-number", serno);
++		} else if (atag->hdr.tag == ATAG_MV_UBOOT) {
++			/* This ATAG provides up to 4 MAC addresses */
++			setprop(fdt, "eth0", "mac-address", atag->u.mv_uboot.macAddr[0], 6);
++			setprop(fdt, "eth1", "mac-address", atag->u.mv_uboot.macAddr[1], 6);
++			setprop(fdt, "eth2", "mac-address", atag->u.mv_uboot.macAddr[2], 6);
++			setprop(fdt, "eth3", "mac-address", atag->u.mv_uboot.macAddr[3], 6);
+ 		}
+ 	}
+ 
+-- 
+2.23.0
+