ar71xx: Add kernel 4.9 support

This add support for kernel 4.9 to the ar71xx target.
It was compile tested with the generic, NAND and mikrotik subtarget.
Multiple members of the community tested it on their boards and did not
report any major problem so far.

Especially the NAND part received some changes to adapt to the new
kernel APIs. The serial driver hack used for the Arduino Yun was not
ported because the kernel changed there a lot.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 42 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/506-MIPS-ath79-prom-parse-redboot-args.patch b/target/linux/ar71xx/patches-4.9/506-MIPS-ath79-prom-parse-redboot-args.patch
new file mode 100644
index 0000000000..46beeffeea
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/506-MIPS-ath79-prom-parse-redboot-args.patch
@@ -0,0 +1,42 @@
+--- a/arch/mips/ath79/prom.c
++++ b/arch/mips/ath79/prom.c
+@@ -22,10 +22,39 @@
+ 
+ #include "common.h"
+ 
++static char ath79_cmdline_buf[COMMAND_LINE_SIZE] __initdata;
++
++static void __init ath79_prom_append_cmdline(const char *name,
++					      const char *value)
++{
++	snprintf(ath79_cmdline_buf, sizeof(ath79_cmdline_buf),
++		 " %s=%s", name, value);
++	strlcat(arcs_cmdline, ath79_cmdline_buf, sizeof(arcs_cmdline));
++}
++
+ void __init prom_init(void)
+ {
++	const char *env;
++
+ 	fw_init_cmdline();
+ 
++	env = fw_getenv("ethaddr");
++	if (env)
++		ath79_prom_append_cmdline("ethaddr", env);
++
++	env = fw_getenv("board");
++	if (env) {
++		/* Workaround for buggy bootloaders */
++		if (strcmp(env, "RouterStation") == 0 ||
++		    strcmp(env, "Ubiquiti AR71xx-based board") == 0)
++			env = "UBNT-RS";
++
++		if (strcmp(env, "RouterStation PRO") == 0)
++			env = "UBNT-RSPRO";
++
++		ath79_prom_append_cmdline("board", env);
++	}
++
+ #ifdef CONFIG_BLK_DEV_INITRD
+ 	/* Read the initrd address from the firmware environment */
+ 	initrd_start = fw_getenvl("initrd_start");