Hello
I have a raspberry pi 4, 4G
/proc/cpuinfo shows
Hardware : BCM2835
Revision : c03112 << THIS IS A PROBLEM
Serial : 100000007ef4bf9c
Model : Raspberry Pi 4 Model B Rev 1.2
and those values will fail trying to load the hal_pi_gpio module.
When I tried to use hal_pi_gpio,
I got this error.
pi@raspberrypi:~ $ linuxcnc
LINUXCNC - 2.8.0~pre1
Machine configuration directory is
'/home/pi/linuxcnc/configs/NEW-rpi4-2250vel-nohome'
Machine configuration file is 'rpi4-2250vel-nohome.ini'
Starting LinuxCNC...
Found file(REL): ./rpi4-2250vel-nohome.hal
Note: Using POSIX realtime
HAL_PI_GPIO: ERROR: board revision 6 not supported
hal_pi_gpio: rtapi_app_main: Invalid argument (-22)
...
so i looked why rev 6 is not allowed
in hal_pi_gpio.c I read...
int rtapi_app_main(void)
{
int n, retval = 0;
int rev, ncores, pinno;
char *endptr;
if ((rev = get_rpi_revision()) < 0) {
rtapi_print_msg(RTAPI_MSG_ERR,
"unrecognized Raspberry revision, see
/proc/cpuinfo\n");
return -EINVAL;
}
ncores = number_of_cores();
rtapi_print_msg(RTAPI_MSG_INFO, "%d cores rev %d", ncores, rev);
switch (rev) {
case 5:
rtapi_print_msg(RTAPI_MSG_INFO, "Raspberry4\n");
pins = rpi2_pins;
gpios = rpi2_gpios;
npins = sizeof(rpi2_pins);
break;
... NOTE 6 IS NOT A VALID CASE
default:
rtapi_print_msg(RTAPI_MSG_ERR,
"HAL_PI_GPIO: ERROR: board revision %d not
supported\n", rev);
return -EINVAL;
...
}
well, I think the value 'rev' will return 6 for my hdwr
because
cpuinfo.c has
int get_revision(void){
...
else if ((strcmp(revision, "a03111") == 0) ||
(strcmp(revision, "b03111") == 0) ||
(strcmp(revision, "c03111") == 0)) // tjp note NOT "c031112"
return 5;
else // assume rev 5
return 6; //tjp 6 is what mine
returns
}
now my /proc/cpuinfo shows
Hardware : BCM2835
Revision : c03112
Serial : 100000007ef4bf9c
Model : Raspberry Pi 4 Model B Rev 1.2
so my board falls into default '6'
and 6 fails
If i am correct ,
then the fix seems to be in the detection by cpuinfo ( reurning 6 )
or
in the action taken by hal_pi_gpio.c rtapi_app_main where it has no rev
6 case
what to do?
thanks tomp
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