arc770: update kernel version to 5.4

Update config with make kernel_oldconfig and copy/refresh patch.

Add CONFIG_WATCHDOG_CORE=y to fix the following error as done for
several targets already:

 Package kmod-hwmon-sch5627 is missing dependencies for the following
 libraries:
 watchdog.ko

Directly switch to kernel 5.4.

This patch is compile-tested only. However, the target is essentially
pure upstream with a single patch, and it has been reported that
kernel 5.4 has been run on this target successfully already.

Note that in my local tests building with all packages/kmods failed
since openvswitch selects libunwind, which doesn't build for arc with
the following error:

checking if we should build libunwind-ptrace... yes
checking if we should build libunwind-setjmp... yes
checking for build architecture... x86_64
checking for host architecture... arc
checking for target architecture... arc
checking for target operating system... linux-gnu
checking for ELF helper width... configure: error: Unknown ELF target: arc
make[3]: *** [Makefile:65: /data/openwrt/build_dir/target-arc_arc700_uClibc/
   libunwind-1.3.1/.configured_68b329da9893e34099c7d8ad5cb9c940] Error 1

Deselecting all kmod-openvswitch* packages will have the build run through.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/target/linux/arc770/patches-5.4/700-stmmac-Disable-frame-filtering-completely.patch b/target/linux/arc770/patches-5.4/700-stmmac-Disable-frame-filtering-completely.patch
new file mode 100644
index 0000000000..9adfcb1be2
--- /dev/null
+++ b/target/linux/arc770/patches-5.4/700-stmmac-Disable-frame-filtering-completely.patch
@@ -0,0 +1,31 @@
+From 0031b9011cb2b2b1de4dbb4f9620303aec760db4 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin@synopsys.com>
+Date: Wed, 27 Jul 2016 11:33:14 +0300
+Subject: [PATCH] stmmac: Disable frame filtering completely
+
+For some [still unknown] reason in ARC SDP boards
+DW GMAC doesn't enter promiscuous mode if eth0 gets
+added to the br-lan interface before Ethernet PHY finishes
+autonegotiation (PHY gets reset on DW GMAC start).
+
+As a work-around we completely disable frame filtering
+in GMAC hardware which gives us working bridge that consists
+of eth0 and wlan0 (USB Wi-Fi dongle). I.e. we finally have
+working "Dumb AP" setup made of ARC AXS10x boards.
+
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+---
+ drivers/net/ethernet/stmicro/stmmac/common.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/stmicro/stmmac/common.h
++++ b/drivers/net/ethernet/stmicro/stmmac/common.h
+@@ -42,7 +42,7 @@
+ #define STMMAC_GET_ENTRY(x, size)	((x + 1) & (size - 1))
+ 
+ #undef FRAME_FILTER_DEBUG
+-/* #define FRAME_FILTER_DEBUG */
++#define FRAME_FILTER_DEBUG
+ 
+ /* Extra statistic and debug information exposed by ethtool */
+ struct stmmac_extra_stats {