ipq806x: add support for Linksys EA7500 V1

This patch adds support for the Linksys EA7500 V1 router.

Specification:
 - CPU: Qualcomm IPQ8064
 - RAM: 256MB
 - Flash: NAND 128MB
 - WiFi: QCA9982 an+ac + QCA9983 bgn
 - Ethernet: 5 GBE Ports (WAN+ 4xLAN) (QCA8337)
 - USB: 1x USB 3.0 1x USB2.0
 - Serial console: RJ-45 115200 8n1 (1V8 Voltage level)
 - 2 Buttons
 - 1 LED

Known issues:
 - Some devices won't flash via web gui

Installation:
- Newer stock images doesn't allow to install custom firmware.
- Please downgrade software to 1.1.2 version. Official firmware:
https://downloads.linksys.com/downloads/firmware/FW_EA7500_1.1.2.172843_prod.gpg.img
- Do it two times to downgrade all stored images.
- Apply factory image via web-gui.

Serial + TFTP method:
 - downgrade to 1.1.2 two times
 - connect ehternet and serial cable
 - set ip address of tftp server to 192.168.1.254
 - put openwrt factory image to tftp folder and rename it to macan.bin
 - stop device while booting in u-boot
 - run command: "run flashimg"
 - run command: "setenv boot_part 1"
 - run command "saveenv"
 - reset

Back to stock:
- Please use old non-gpg image like this 1.1.2:
https://downloads.linksys.com/downloads/firmware/FW_EA7500_1.1.2.172843_prod.img
- ssh to router and copy image to tmp
- use sysupgrade -n -F

Tested by github users: @jack338c and @grzesiczek1

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
[removed i2c4_pins, mdio0_pins, nand_pins, rgmii2_pins from DTSI]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

2 files changed, 44 insertions, 22 deletions

diff --git a/target/linux/ipq806x/patches-5.4/0067-generic-Mangle-bootloader-s-kernel-arguments.patch b/target/linux/ipq806x/patches-5.4/0067-generic-Mangle-bootloader-s-kernel-arguments.patch
index 396309d203..99a64ccadc 100644
--- a/target/linux/ipq806x/patches-5.4/0067-generic-Mangle-bootloader-s-kernel-arguments.patch
+++ b/target/linux/ipq806x/patches-5.4/0067-generic-Mangle-bootloader-s-kernel-arguments.patch
@@ -51,41 +51,62 @@ Signed-off-by: Adrian Panella <ianchi74@outlook.com>
  #else
  #define do_extend_cmdline 0
  #endif
-@@ -67,6 +69,59 @@ static uint32_t get_cell_size(const void
+@@ -67,6 +69,80 @@ static uint32_t get_cell_size(const void
  	return cell_size;
  }
  
 +#if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE)
++/**
++ * taken from arch/x86/boot/string.c
++ * local_strstr - Find the first substring in a %NUL terminated string
++ * @s1: The string to be searched
++ * @s2: The string to search for
++ */
++static char *local_strstr(const char *s1, const char *s2)
++{
++	size_t l1, l2;
++
++	l2 = strlen(s2);
++	if (!l2)
++		return (char *)s1;
++	l1 = strlen(s1);
++	while (l1 >= l2) {
++		l1--;
++		if (!memcmp(s1, s2, l2))
++			return (char *)s1;
++		s1++;
++	}
++	return NULL;
++}
 +
 +static char *append_rootblock(char *dest, const char *str, int len, void *fdt)
 +{
-+	char *ptr, *end;
++	char *ptr, *end, *tmp;
 +	char *root="root=";
++	char *find_rootblock;
 +	int i, l;
 +	const char *rootblock;
 +
-+	//ARM doesn't have __HAVE_ARCH_STRSTR, so search manually
-+	ptr = str - 1;
-+
-+	do {
-+		//first find an 'r' at the begining or after a space
-+		do {
-+			ptr++;
-+			ptr = strchr(ptr, 'r');
-+			if(!ptr) return dest;
++	find_rootblock = getprop(fdt, "/chosen", "find-rootblock", &l);
++	if(!find_rootblock)
++		find_rootblock = root;
 +
-+		} while (ptr != str && *(ptr-1) != ' ');
++	//ARM doesn't have __HAVE_ARCH_STRSTR, so it was copied from x86
++	ptr = local_strstr(str, find_rootblock);
 +
-+		//then check for the rest
-+		for(i = 1; i <= 4; i++)
-+			if(*(ptr+i) != *(root+i)) break;
-+
-+	} while (i != 5);
++	if(!ptr)
++		return dest;
 +
 +	end = strchr(ptr, ' ');
 +	end = end ? (end - 1) : (strchr(ptr, 0) - 1);
 +
-+	//find partition number (assumes format root=/dev/mtdXX | /dev/mtdblockXX | yy:XX )
++	// Some boards ubi.mtd=XX,ZZZZ, so let's check for '," too.
++	tmp = strchr(ptr, ',');
++
++	if(tmp)
++		end = end < tmp ? end : tmp - 1;
++
++	//find partition number (assumes format root=/dev/mtdXX | /dev/mtdblockXX | yy:XX | ubi.mtd=XX,ZZZZ )
 +	for( i = 0; end >= ptr && *end >= '0' && *end <= '9'; end--, i++);
 +	ptr = end + 1;
 +
@@ -111,7 +132,7 @@ Signed-off-by: Adrian Panella <ianchi74@outlook.com>
  static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline)
  {
  	char cmdline[COMMAND_LINE_SIZE];
-@@ -86,12 +141,21 @@ static void merge_fdt_bootargs(void *fdt
+@@ -86,12 +162,21 @@ static void merge_fdt_bootargs(void *fdt
  
  	/* and append the ATAG_CMDLINE */
  	if (fdt_cmdline) {
@@ -133,7 +154,7 @@ Signed-off-by: Adrian Panella <ianchi74@outlook.com>
  	}
  	*ptr = '\0';
  
-@@ -166,7 +230,9 @@ int atags_to_fdt(void *atag_list, void *
+@@ -166,7 +251,9 @@ int atags_to_fdt(void *atag_list, void *
  			else
  				setprop_string(fdt, "/chosen", "bootargs",
  					       atag->u.cmdline.cmdline);
@@ -144,7 +165,7 @@ Signed-off-by: Adrian Panella <ianchi74@outlook.com>
  			if (memcount >= sizeof(mem_reg_property)/4)
  				continue;
  			if (!atag->u.mem.size)
-@@ -210,6 +276,10 @@ int atags_to_fdt(void *atag_list, void *
+@@ -210,6 +297,10 @@ int atags_to_fdt(void *atag_list, void *
  		setprop(fdt, "/memory", "reg", mem_reg_property,
  			4 * memcount * memsize);
  	}
diff --git a/target/linux/ipq806x/patches-5.4/0069-arm-boot-add-dts-files.patch b/target/linux/ipq806x/patches-5.4/0069-arm-boot-add-dts-files.patch
index 1d21703bdd..8cdd198c29 100644
--- a/target/linux/ipq806x/patches-5.4/0069-arm-boot-add-dts-files.patch
+++ b/target/linux/ipq806x/patches-5.4/0069-arm-boot-add-dts-files.patch
@@ -10,7 +10,7 @@ Signed-off-by: John Crispin <john@phrozen.org>
 
 --- a/arch/arm/boot/dts/Makefile
 +++ b/arch/arm/boot/dts/Makefile
-@@ -843,6 +843,18 @@ dtb-$(CONFIG_ARCH_QCOM) += \
+@@ -843,6 +843,19 @@ dtb-$(CONFIG_ARCH_QCOM) += \
  	qcom-ipq4019-ap.dk07.1-c1.dtb \
  	qcom-ipq4019-ap.dk07.1-c2.dtb \
  	qcom-ipq8064-ap148.dtb \
@@ -18,6 +18,7 @@ Signed-off-by: John Crispin <john@phrozen.org>
 +	qcom-ipq8064-d7800.dtb \
 +	qcom-ipq8064-db149.dtb \
 +	qcom-ipq8064-ap161.dtb \
++	qcom-ipq8064-ea7500-v1.dtb \
 +	qcom-ipq8064-ea8500.dtb \
 +	qcom-ipq8064-r7500.dtb \
 +	qcom-ipq8064-r7500v2.dtb \