loader: config: set CONFIG_EVENTS=y

[facchinm]

Fixes #243 (comment)

[mjs513]

@facchinm @KurtE

I have been testing this change with my Threading testing sketches. Some sketches are still still failing.

• Thread create - works
• Thread define -works
• Thread Mutexes, Thread Semaphore failing with following error message:

[00:00:00.202,000] <err> llext: Region 1 ELF file range (0x1bc0-0x1e87) overlaps with 2 (0x1c20-0x1e67)
[00:00:00.214,000] <err> llext: Failed to map ELF sections, ret -8
Failed to load sketch, rc -8

[KurtE]

@facchinm @mjs513 @pillo79 - I believe I have this synced in... (I rebased my defer camera branch) to the latest this morning,
and CONFIG_EVENTS=y is in prj.conf. I did a sync to it, did a west update, extras/build_all, copy the stuff to windows...

I then rebuilt sketch to run using events:

struct k_event my_event;
#define STACK_SIZE 1024
#define PRIORITY 7

K_THREAD_STACK_DEFINE(thread1_stack, STACK_SIZE);
struct k_thread thread1_data;
k_tid_t thread1_tid;


void thread1(void *p1, void *p2, void *p3) {
  UNUSED(p1);
  UNUSED(p2);
  UNUSED(p3);
  while (1) {
    printk("%u: Thread\n", (uint32_t)millis());
    k_sleep(K_MSEC(1000));
    k_event_set(&my_event, 0x001);
    k_sleep(K_MSEC(1000));
  }
}


void setup() {
  k_event_init(&my_event);
  thread1_tid = k_thread_create(&thread1_data, thread1_stack, K_THREAD_STACK_SIZEOF(thread1_stack),
                                thread1, NULL, NULL, NULL, PRIORITY, 0, K_NO_WAIT);
}

void loop() {
  uint32_t events;
  events = k_event_wait(&my_event, 0xFFF, true, K_MSEC(2000));
  if (events == 0) {
    printk("Timeout");
  } else {
    printk("l%u:loop\n", (uint32_t)millis());
  }
}

Uploaded it to the Q, and my debug window shows:

uart:~$
[00:00:00.202,000] <err> llext: Undefined symbol with no entry in symbol table z_impl_k_event_set, offset 60, link                                section 8
[00:00:00.216,000] <err> elf: Could not find symbol z_impl_k_event_set!
[00:00:00.226,000] <err> llext: Undefined symbol with no entry in symbol table z_impl_k_event_init, offset 128, li                               nk section 8
[00:00:00.240,000] <err> elf: Could not find symbol z_impl_k_event_init!
[00:00:00.250,000] <err> llext: Undefined symbol with no entry in symbol table z_impl_k_event_wait, offset 216, li                               nk section 8
[00:00:00.264,000] <err> elf: Could not find symbol z_impl_k_event_wait!
[00:00:00.274,000] <err> llext: Failed to link, ret -61
Failed to load sketch, rc -61
uart:~$

[KurtE]

Oops - forgot to redo the bootloader, now appears to run... 😄