The mediatek board 'mt7621', is having a external watchdog timer, it
resets the GPIO-18 every 500ms.
To handle this scenario.
I modified the our dts file dummy.dts, added 'wdt-gpio'
#include "mt7621.dtsi"/ {
compatible = "mediatek,dummy", "mediatek,mt7621-soc";
model = "Dummy MT7621";
memory@0 {
device_type = "memory";
reg = <0x0 0x8000000>;
}; chosen {
bootargs = "console=ttyS1,115200n8";
};
wdt-gpio {
compatible = "linux,wdt-gpio";
gpios = <&gpio0 18 1>;
hw_algo = "toggle";
hw_margin_ms = <400>;
always-running = <1>;
};
};
Added the following in Kernel config file, config-4.9
CONFIG_GPIO_WATCHDOG=y
CONFIG_GPIO_WATCHDOG_ARCH_INITCALL=y
to compile, drivers/watchdog/gpio_wdt.c
But, this resulted in 'gpio_wdt_probe', getting called before mt7621_gpio.
logs->
[ 0.410000] gpio_wdt_probe,
[ 0.420000] gpio_wdt_probe, 170, priv->gpio=-517, flags=-2146148000
[ 0.490000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.490000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.500000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.500000] clocksource: Switched to clocksource GIC
[ 0.510000] NET: Registered protocol family 2
So i modified
drivers/watchdog/gpio_wdt.c
-arch_initcall(gpio_wdt_init);
+subsys_initcall(gpio_wdt_init);
This resulted in, correct sequence..
mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.450000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.460000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.460000] of_get_named_gpio_flags, 112
[ 0.470000] gpio_wdt_probe, priv->gpio=18
[ 0.470000] gpio_wdt_probe, 216
The device WDT reset is not happening anymore, and boots fully..
[ 12.690000] br-lan: port 1(eth0.1) entered disabled state
[ 12.700000] device eth0.1 entered promiscuous mode
[ 12.710000] device eth0 entered promiscuous mode
[ 12.720000] br-lan: port 1(eth0.1) entered blocking state
[ 12.720000] br-lan: port 1(eth0.1) entered forwarding state
[ 103.470000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link down
[ 111.710000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link up
But the issue is console not accepting commands
when i press enter or type anything the command is not seen on the console.
Can someone help me!!
Mani
Starting kernel ...
[ 0.000000] Linux version 4.9.20 (mani@mani) (gcc version 5.4.0 (LEDE GCC 5.4.0 r3990-d93482a) ) #0 SMP Tue Apr 11 13:05:09 2017
[ 0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[ 0.000000] MIPS: machine is Dummy MT7621
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 08000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] VPE topology {2,2} total 4
[ 0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.000000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] HighMem empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] percpu: Embedded 12 pages/cpu @8110e000 s17712 r8192 d23248 u49152
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
[ 0.000000] Kernel command line: console=ttyS1,115200n8 rootfstype=squashfs,jffs2
[ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Writing ErrCtl register=00000c00
[ 0.000000] Readback ErrCtl register=00000c00
[ 0.000000] Memory: 121848K/131072K available (3875K kernel code, 201K rwdata, 892K rodata, 2572K init, 256K bss, 9224K reserved, 0K cma-re)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS:256
[ 0.000000] clocksource: GIC: mask: 0xffffffffffffffff max_cycles: 0xcaf478abb4, max_idle_ns: 440795247997 ns
[ 0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
[ 0.000000] Calibrating delay loop... 586.13 BogoMIPS (lpj=2930688)
[ 0.070000] pid_max: default: 32768 minimum: 301
[ 0.070000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.080000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.090000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.090000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.090000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.090000] CPU1 revision is: 0001992f (MIPS 1004Kc)
[ 0.170000] Synchronize counters for CPU 1:
[ 0.170000] done.
[ 0.170000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.170000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.170000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.170000] CPU2 revision is: 0001992f (MIPS 1004Kc)
[ 0.250000] Synchronize counters for CPU 2:
[ 0.250000] done.
[ 0.250000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.250000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.250000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.250000] CPU3 revision is: 0001992f (MIPS 1004Kc)
[ 0.330000] Synchronize counters for CPU 3:
[ 0.330000] done.
[ 0.330000] Brought up 4 CPUs
[ 0.340000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.350000] futex hash table entries: 1024 (order: 3, 32768 bytes)
[ 0.350000] pinctrl core: initialized pinctrl subsystem
[ 0.360000] NET: Registered protocol family 16
[ 0.450000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.450000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.460000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.460000] of_get_named_gpio_flags, 112
[ 0.470000] gpio_wdt_probe, priv->gpio=18
[ 0.470000] gpio_wdt_probe, 216
[ 0.470000] clocksource: Switched to clocksource GIC
[ 0.480000] NET: Registered protocol family 2
[ 0.480000] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.480000] TCP bind hash table entries: 1024 (order: 1, 8192 bytes)
[ 0.490000] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.500000] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 0.500000] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 0.510000] NET: Registered protocol family 1
[ 2.650000] Crashlog allocated RAM at address 0x3f00000
[ 2.660000] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[ 2.670000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 2.680000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 2.690000] random: fast init done
[ 2.690000] io scheduler noop registered
[ 2.700000] io scheduler deadline registered (default)
[ 2.700000] Serial: 8250/16550 driver, 3 ports, IRQ sharing disabled
[ 2.710000] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 17, base_baud = 3125000) is a 16550A
[ 2.720000] spi-mt7621 1e000b00.spi: sys_freq: 50000000
[ 2.730000] m25p80 spi32766.0: using chunked io (size=32)
[ 2.730000] m25p80 spi32766.0: mx66l51235l (65536 Kbytes)
[ 2.740000] 4 ofpart partitions found on MTD device spi32766.0
[ 2.740000] Creating 4 MTD partitions on "spi32766.0":
[ 2.750000] 0x000000000000-0x000000030000 : "Bootloader"
[ 2.750000] 0x000000030000-0x000000040000 : "Config"
[ 2.760000] 0x000000040000-0x000000050000 : "factory"
[ 2.770000] 0x000000050000-0x000001000000 : "firmware"
[ 2.810000] libphy: Fixed MDIO Bus: probed
[ 2.810000] netif_napi_add() called with weight 128 on device eth%d
[ 2.830000] mtk_soc_eth 1e100000.ethernet: generated random MAC address f6:f0:dd:2a:92:c8
[ 2.840000] libphy: mdio: probed
[ 4.250000] mtk_soc_eth 1e100000.ethernet: loaded mt7530 driver
[ 4.260000] mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 20
[ 4.270000] Netfilter messages via NETLINK v0.30.
[ 4.270000] nf_conntrack version 0.5.0 (2048 buckets, 8192 max)
[ 4.280000] NET: Registered protocol family 10
[ 4.290000] NET: Registered protocol family 17
[ 4.290000] 8021q: 802.1Q VLAN Support v1.8
[ 4.300000] hctosys: unable to open rtc device (rtc0)
[ 4.300000] Warning: unable to open an initial console.
[ 4.320000] Freeing unused kernel memory: 2572K (804dd000 - 80760000)
[ 4.320000] This architecture does not have kernel memory protection.
[ 4.340000] init: Console is alive
[ 4.340000] init: - watchdog -
[ 4.360000] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 4.360000] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 4.380000] init: - preinit -
[ 6.150000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link up
[ 6.570000] procd: - early -
[ 6.580000] procd: - watchdog -
[ 7.190000] procd: failed to set stdio
[ 7.190000] procd: - ubus -
[ 7.250000] procd: - init -
[ 7.360000] kmodloader: loading kernel modules from /etc/modules.d/*
[ 7.370000] tun: Universal TUN/TAP device driver, 1.6
[ 7.370000] tun: (C) 1999-2004 Max Krasnyansky <m...@qualcomm.com>
[ 7.380000] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 7.390000] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 7.430000] xt_time: kernel timezone is -0000
[ 7.440000] PPP generic driver version 2.4.2
[ 7.440000] NET: Registered protocol family 24
[ 7.450000] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 11.280000] random: crng init done
[ 12.690000] br-lan: port 1(eth0.1) entered blocking state
[ 12.690000] br-lan: port 1(eth0.1) entered disabled state
[ 12.700000] device eth0.1 entered promiscuous mode
[ 12.710000] device eth0 entered promiscuous mode
[ 12.720000] br-lan: port 1(eth0.1) entered blocking state
[ 12.720000] br-lan: port 1(eth0.1) entered forwarding state
[ 103.470000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link down
[ 111.710000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link up
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