brcm63xx: add linux 4.19 support

Boot tested on Comtrend AR-5387un:
https://gist.github.com/Noltari/57e5030455da8dc38e61f8c3a5922254

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jonas.gorski: make 4.19 an optional testing version; add gcc 8.3 fix]
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-4.19/364-MIPS-BCM63XX-allow-board-files-to-provide-sprom-fixu.patch b/target/linux/brcm63xx/patches-4.19/364-MIPS-BCM63XX-allow-board-files-to-provide-sprom-fixu.patch
new file mode 100644
index 0000000000..74c2846d5f
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.19/364-MIPS-BCM63XX-allow-board-files-to-provide-sprom-fixu.patch
@@ -0,0 +1,67 @@
+From 8575548b08e33c9ff4fd540abec09dd177e33682 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Thu, 31 Jul 2014 19:12:33 +0200
+Subject: [PATCH 09/10] MIPS: BCM63XX: allow board files to provide sprom
+ fixups
+
+Allow board_info files to supply fixups for the base sproms to adapt
+them to the actual used sprom contents in case they do not use the
+default ones.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ arch/mips/bcm63xx/sprom.c                                  | 14 +++++++++++++-
+ .../mips/include/asm/mach-bcm63xx/bcm63xx_fallback_sprom.h |  8 ++++++++
+ 2 files changed, 21 insertions(+), 1 deletion(-)
+
+--- a/arch/mips/bcm63xx/sprom.c
++++ b/arch/mips/bcm63xx/sprom.c
+@@ -883,6 +883,14 @@ static int sprom_extract(struct ssb_spro
+ 	return 0;
+ }
+ 
++void sprom_apply_fixups(u16 *sprom, struct sprom_fixup *fixups, int n)
++{
++	unsigned int i;
++
++	for (i = 0; i < n; i++)
++		sprom[fixups[i].offset] = fixups[i].value;
++}
++
+ static __initdata u16 template_sprom[220];
+ #endif
+ 
+@@ -961,8 +969,12 @@ int __init bcm63xx_register_fallback_spr
+ 		return -EINVAL;
+ 	}
+ 
+-	if (size > 0)
++	if (size > 0) {
++		sprom_apply_fixups(template_sprom, data->board_fixups,
++				   data->num_board_fixups);
++
+ 		sprom_extract(&bcm63xx_sprom, template_sprom, size);
++	}
+ 
+ 	memcpy(bcm63xx_sprom.il0mac, data->mac_addr, ETH_ALEN);
+ 	memcpy(bcm63xx_sprom.et0mac, data->mac_addr, ETH_ALEN);
+--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_fallback_sprom.h
++++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_fallback_sprom.h
+@@ -21,9 +21,17 @@ enum sprom_type {
+ 	SPROM_BCM4331,
+ };
+ 
++struct sprom_fixup {
++	u16 offset;
++	u16 value;
++};
++
+ struct fallback_sprom_data {
+ 	u8 mac_addr[ETH_ALEN];
+ 	enum sprom_type type;
++
++	struct sprom_fixup *board_fixups;
++	unsigned int num_board_fixups;
+ };
+ 
+ int bcm63xx_register_fallback_sprom(struct fallback_sprom_data *data);