uboot-mediatek: add support for Linksys E8450

Build U-Boot for the Linksys E8450 in order to have support for UBI.
The loader has a default environment with scripts handling the reset
button as well as fall-back to recovery firmware. If the loader comes
up without a valid environment found in UBI, it will automatically
make sure UBI is formatted and create a new environment and proceed
to load recovery firmware (either from UBI or via TFTP if recovery is
corrupted or unavailable).

If the button is held down during power-on, the yellow status LED
turns on and the bootloader environment is reset to factory defaults.
If the button is released at this point, the recovery firmware (if
existing) is loaded from UBI and booted.
If the button is continously held down even beyond the point that
the yellow LED turned on, the loader will try to load the recovery
firmware via TFTP from server 192.168.1.254, write it to UBI and
boot.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 116 insertions, 0 deletions

diff --git a/package/boot/uboot-mediatek/patches/007-env-readmem.patch b/package/boot/uboot-mediatek/patches/007-env-readmem.patch
new file mode 100644
index 0000000000..a8c88a2757
--- /dev/null
+++ b/package/boot/uboot-mediatek/patches/007-env-readmem.patch
@@ -0,0 +1,116 @@
+--- a/cmd/Kconfig
++++ b/cmd/Kconfig
+@@ -571,6 +571,12 @@ config CMD_ENV_EXISTS
+ 	  Check if a variable is defined in the environment for use in
+ 	  shell scripting.
+ 
++config CMD_ENV_READMEM
++	bool "env readmem"
++	default y
++	help
++	  Store memory content into environment variable.
++
+ config CMD_ENV_CALLBACK
+ 	bool "env callbacks - print callbacks and their associated variables"
+ 	help
+--- a/cmd/nvedit.c
++++ b/cmd/nvedit.c
+@@ -469,6 +469,60 @@ int do_env_ask(struct cmd_tbl *cmdtp, in
+ }
+ #endif
+ 
++#if defined(CONFIG_CMD_ENV_READMEM)
++int do_env_readmem(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
++{
++	char varstr[CONFIG_SYS_CBSIZE];
++	const void *buf;
++	char *local_args[4];
++	ulong addr, bytes = 6;
++	int hexdump = 0;
++
++	/*
++	 * Check the syntax:
++	 *
++	 * readmem [-b] name address [size]
++	 */
++	if (argc < 3)
++		return CMD_RET_USAGE;
++
++	local_args[0] = argv[0];
++
++	if (!strncmp(argv[1], "-b", 3))
++		hexdump = 1;
++
++	local_args[1] = argv[hexdump + 1];
++	local_args[2] = varstr;
++	local_args[3] = NULL;
++
++	addr = simple_strtoul(argv[hexdump + 2], NULL, 16);
++
++	if (!hexdump)
++		bytes = simple_strtoul(argv[hexdump + 3], NULL, 16);
++
++	if (bytes < 1)
++		return 1;
++
++	if ((hexdump * 3) * bytes >= CONFIG_SYS_CBSIZE)
++		return 1;
++
++	buf = map_sysmem(addr, bytes);
++	if (!buf)
++		return 1;
++
++	if (hexdump) {
++		sprintf(varstr, "%pM", buf);
++	} else {
++		memcpy(varstr, buf, bytes);
++		varstr[bytes] = '\0';
++	}
++	unmap_sysmem(buf);
++
++	/* Continue calling setenv code */
++	return _do_env_set(flag, 3, local_args, H_INTERACTIVE);
++}
++#endif
++
+ #if defined(CONFIG_CMD_ENV_CALLBACK)
+ static int print_static_binding(const char *var_name, const char *callback_name,
+ 				void *priv)
+@@ -1373,6 +1427,9 @@ static struct cmd_tbl cmd_env_sub[] = {
+ 	U_BOOT_CMD_MKENT(load, 1, 0, do_env_load, "", ""),
+ #endif
+ 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
++#if defined(CONFIG_CMD_ENV_READMEM)
++	U_BOOT_CMD_MKENT(readmem, CONFIG_SYS_MAXARGS, 3, do_env_readmem, "", ""),
++#endif
+ #if defined(CONFIG_CMD_RUN)
+ 	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
+ #endif
+@@ -1461,6 +1518,9 @@ static char env_help_text[] =
+ #if defined(CONFIG_CMD_NVEDIT_EFI)
+ 	"env print -e [-guid guid] [-n] [name ...] - print UEFI environment\n"
+ #endif
++#if defined(CONFIG_CMD_ENV_READMEM)
++	"env readmem [-b] name address size - read variable from memory\n"
++#endif
+ #if defined(CONFIG_CMD_RUN)
+ 	"env run var [...] - run commands in an environment variable\n"
+ #endif
+@@ -1570,6 +1630,17 @@ U_BOOT_CMD(
+ );
+ #endif
+ 
++#if defined(CONFIG_CMD_ENV_READMEM)
++U_BOOT_CMD_COMPLETE(
++	readmem,	CONFIG_SYS_MAXARGS,	3,	do_env_readmem,
++	"get environment variable from memory address",
++	"name [-b] address size\n"
++	"    - store memory address to env variable\n"
++	"      \"-b\": read binary ethaddr",
++	var_complete
++);
++#endif
++
+ #if defined(CONFIG_CMD_RUN)
+ U_BOOT_CMD_COMPLETE(
+ 	run,	CONFIG_SYS_MAXARGS,	1,	do_run,