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make work on newer BBB images? #372

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12 changes: 12 additions & 0 deletions source/common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -560,12 +560,24 @@ int get_spi_bus_path_number(unsigned int spi)
If u-boot overlays are enabled, then device tree overlays should not
be loaded with the cape manager by writing to the slots file. There
is currently a kernel bug that causes the write to hang.

On even newer images, bone_capemgr is not a thing. Instead, maybe we look
for /proc/device-tree/chosen/overlays ?

*/
int uboot_overlay_enabled(void) {
const char *cmd = "/bin/grep -c bone_capemgr.uboot_capemgr_enabled=1 /proc/cmdline";
char uboot_overlay;
FILE *file = NULL;

file = fopen("/proc/device-tree/chosen/overlays","r");
if (file != NULL) {
fclose(file);
syslog(LOG_DEBUG, "Adafruit_BBIO: uboot_overlay_enabled() is true\n");
return 1;
}


file = popen(cmd, "r");
if (file == NULL) {
fprintf(stderr, "error: uboot_overlay_enabled() failed to run cmd=%s\n", cmd);
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