Gqwill69: Created page with "* A10 Thunder 840 (TH840) Opnsense firewall Direct write the opensense nano amd64 img to a SSD or a Compact Flash. Boot the appliance and you have <3minutes to create the file and execute it. * A10 Thunder 840 install of Opnsense:
Must create watchdog disable script with "vi"
*vi /tmp/disarm_wdt.c

 #include  #include  #include  #include   #define PORT_INDEX 0x4E #define PORT_DATA  0x4F  int main(void) {..."

2026-09-22T23:22:01Z

Created page with "* A10 Thunder 840 (TH840) Opnsense firewall Direct write the opensense nano amd64 img to a SSD or a Compact Flash. Boot the appliance and you have <3minutes to create the file and execute it. * A10 Thunder 840 install of Opnsense: Must create watchdog disable script with "vi" *vi /tmp/disarm_wdt.c <pre> #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <machine/cpufunc.h> #define PORT_INDEX 0x4E #define PORT_DATA 0x4F int main(void) {..."

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* A10 Thunder 840 (TH840) Opnsense firewall
Direct write the opensense nano amd64 img to a SSD or a Compact Flash. Boot the appliance and you have <3minutes to create the file and execute it.

* A10 Thunder 840 install of Opnsense: 
Must create watchdog disable script with "vi" 
*vi /tmp/disarm_wdt.c 
<pre>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <machine/cpufunc.h>

#define PORT_INDEX 0x4E
#define PORT_DATA 0x4F

int main(void) {
int fd = open("/dev/io", O_RDONLY);
if (fd < 0) {
perror("Failed to open /dev/io");
return 1;
}

/* Enter Extended Function Mode */
outb(PORT_INDEX, 0x87);
outb(PORT_INDEX, 0x87);

/* Select Logical Device 8 (Watchdog Timer) */
outb(PORT_INDEX, 0x07);
outb(PORT_DATA, 0x08);

/* Set timeout counter to 0 (CR F6) */
outb(PORT_INDEX, 0xF6);
outb(PORT_DATA, 0x00);

/* Deactivate device (CR 30 = 0x00) */
outb(PORT_INDEX, 0x30);
outb(PORT_DATA, 0x00);

/* Exit Extended Function Mode */
outb(PORT_INDEX, 0xAA);

close(fd);
printf("NCT6776F hardware watchdog disarmed successfully.\n");
return 0;
}
</pre>
<pre>
cc -O2 /tmp/disarm_wdt.c -o /usr/local/etc/rc.syshook.d/early/05-disarm_wdt
chmod 755 /usr/local/etc/rc.syshook.d/early/05-disarm_wdt
/usr/local/etc/rc.syshook.d/early/05-disarm_wdt
</pre>
[[Category:Linux]]

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