// stock BELA overlay loaded, with **no** dummy tx and rx
// ----
// When resource table is unchanged:
// I get an entire stream on infinite:
davinci-mcasp 48460000.mcasp: unhandled rx event. rxstat: 0x00000144

// -------------------------------
// Now, when the resource table is as follows:
// git diff:
diff --git a/resources/rproc-build/common/resource_table_empty.h b/resources/rproc-build/common/resource_table_empty.h
index 07e97d9b..c779a2d3 100644
--- a/resources/rproc-build/common/resource_table_empty.h
+++ b/resources/rproc-build/common/resource_table_empty.h
@@ -1,17 +1,34 @@
 /*
- *  ======== resource_table_empty.h ========
+ * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
  *
- *  Define the resource table entries for all PRU cores. This will be
- *  incorporated into corresponding base images, and used by the remoteproc
- *  on the host-side to allocated/reserve resources.  Note the remoteproc
- *  driver requires that all PRU firmware be built with a resource table.
  *
- *  This file contains an empty resource table.  It can be used either as:
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
  *
- *        1) A template, or
- *        2) As-is if a PRU application does not need to configure PRU_INTC
- *                  or interact with the rpmsg driver
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
  *
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the
+ *       distribution.
+ *
+ *     * Neither the name of Texas Instruments Incorporated nor the names of
+ *       its contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifndef _RSC_TABLE_PRU_H_
@@ -19,21 +36,104 @@

 #include <stddef.h>
 #include <rsc_types.h>
+#include "pru_virtio_ids.h"
+
+/*
+ * Sizes of the virtqueues (expressed in number of buffers supported,
+ * and must be power of 2)
+ */
+#define PRU_RPMSG_VQ0_SIZE     16
+#define PRU_RPMSG_VQ1_SIZE     16
+
+/*
+ * The feature bitmap for virtio rpmsg
+ */
+#define VIRTIO_RPMSG_F_NS      0               //name service notifications
+
+/* This firmware supports name service notifications as one of its features */
+#define RPMSG_PRU_C0_FEATURES  (1 << VIRTIO_RPMSG_F_NS)
+
+/* Definition for unused interrupts */
+#define HOST_UNUSED            255
+
+/* Mapping sysevts to a channel. Each pair contains a sysevt, channel. */
+// struct ch_map pru_intc_map[] = { {16, 2},
+//                              {17, 0},
+// };
+struct ch_map pru_intc_map[] = { {54, 1},
+                 {55, 1},
+};
+

 struct my_resource_table {
        struct resource_table base;

-       uint32_t offset[1]; /* Should match 'num' in actual definition */
+       uint32_t offset[2]; /* Should match 'num' in actual definition */
+
+       /* rpmsg vdev entry */
+       struct fw_rsc_vdev rpmsg_vdev;
+       struct fw_rsc_vdev_vring rpmsg_vring0;
+       struct fw_rsc_vdev_vring rpmsg_vring1;
+
+       /* intc definition */
+       struct fw_rsc_custom pru_ints;
 };

-#pragma DATA_SECTION(pru_remoteproc_ResourceTable, ".resource_table")
-#pragma RETAIN(pru_remoteproc_ResourceTable)
-struct my_resource_table pru_remoteproc_ResourceTable = {
-       1,      /* we're the first version that implements this */
-       0,      /* number of entries in the table */
+#pragma DATA_SECTION(resourceTable, ".resource_table")
+#pragma RETAIN(resourceTable)
+struct my_resource_table resourceTable = {
+       1,      /* Resource table version: only version 1 is supported by the current driver */
+       2,      /* number of entries in the table */
        0, 0,   /* reserved, must be zero */
-       0,      /* offset[0] */
+       /* offsets to entries */
+       {
+               offsetof(struct my_resource_table, rpmsg_vdev),
+               offsetof(struct my_resource_table, pru_ints),
+       },
+
+       /* rpmsg vdev entry */
+       {
+               (uint32_t)TYPE_VDEV,                    //type
+               (uint32_t)VIRTIO_ID_RPMSG,              //id
+               (uint32_t)0,                            //notifyid
+               (uint32_t)RPMSG_PRU_C0_FEATURES,        //dfeatures
+               (uint32_t)0,                            //gfeatures
+               (uint32_t)0,                            //config_len
+               (uint8_t)0,                             //status
+               (uint8_t)2,                             //num_of_vrings, only two is supported
+               { (uint8_t)0, (uint8_t)0 },             //reserved
+               /* no config data */
+       },
+       /* the two vrings */
+       {
+               0,                      //da, will be populated by host, can't pass it in
+               16,                     //align (bytes),
+               PRU_RPMSG_VQ0_SIZE,     //num of descriptors
+               0,                      //notifyid, will be populated, can't pass right now
+               0                       //reserved
+       },
+       {
+               0,                      //da, will be populated by host, can't pass it in
+               16,                     //align (bytes),
+               PRU_RPMSG_VQ1_SIZE,     //num of descriptors
+               0,                      //notifyid, will be populated, can't pass right now
+               0                       //reserved
+       },
+
+       {
+               TYPE_CUSTOM, TYPE_PRU_INTS,
+               sizeof(struct fw_rsc_custom_ints),
+               { /* PRU_INTS version */
+                       0x0000,
+                       /* Channel-to-host mapping, 255 for unused */
+                       0, HOST_UNUSED, 2, HOST_UNUSED, HOST_UNUSED,
+                       HOST_UNUSED, HOST_UNUSED, HOST_UNUSED, HOST_UNUSED, HOST_UNUSED,
+                       /* Number of evts being mapped to channels */
+                       (sizeof(pru_intc_map) / sizeof(struct ch_map)),
+                       /* Pointer to the structure containing mapped events */
+                       pru_intc_map,
+               },
+       },
 };

 #endif /* _RSC_TABLE_PRU_H_ */
// -





// and then I run sinetone/sinetone
// This shows on UART logs: (infinitely)
// ... till I hit ctrl + C

[   62.937859] ---[ end trace 1f2efa44b0c3bbcc ]---
[   62.942977] ------------[ cut here ]------------
[   62.947628] WARNING: CPU: 0 PID: 2954 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x338/0x388
[   62.957070] 44000000.ocp:L3 Standard Error: MASTER MPU TARGET PRUSS1 (Read): At Address: 0x00012080 : Data Access in User mode during Functional access
[   62.970692] Modules linked in: rpmsg_rpc virtio_rpmsg_bus bnep btsdio bluetooth ecdh_generic brcmfmac brcmutil cfg80211 omap_remoteproc remoteproc virtio virtio_ring usb_f_ncm usb_f_mass_storage usb_f_rndis u_ether libcomposite uio_pdrv_genirq uio gpio_pisosr
[   62.993786] CPU: 0 PID: 2954 Comm: sinetone Tainted: G      D W         4.19.94-ti-xenomai-r64 #1buster
[   63.003224] Hardware name: Generic DRA74X (Flattened Device Tree)
[   63.009347] I-pipe domain: Linux
[   63.012603] [<c011419c>] (unwind_backtrace) from [<c010ea1c>] (show_stack+0x20/0x24)
[   63.020392] [<c010ea1c>] (show_stack) from [<c0d7345c>] (dump_stack+0xc8/0xe4)
[   63.027659] [<c0d7345c>] (dump_stack) from [<c013e880>] (__warn.part.3+0xcc/0xe8)
[   63.035185] [<c013e880>] (__warn.part.3) from [<c013e914>] (warn_slowpath_fmt+0x78/0x94)
[   63.043322] [<c013e914>] (warn_slowpath_fmt) from [<c07c1958>] (l3_interrupt_handler+0x338/0x388)
[   63.052244] [<c07c1958>] (l3_interrupt_handler) from [<c01b1500>] (__handle_irq_event_percpu+0x84/0x2d0)
[   63.061774] [<c01b1500>] (__handle_irq_event_percpu) from [<c01b1788>] (handle_irq_event_percpu+0x3c/0x90)
[   63.071478] [<c01b1788>] (handle_irq_event_percpu) from [<c01b1824>] (handle_irq_event+0x48/0x6c)
[   63.080399] [<c01b1824>] (handle_irq_event) from [<c01b5b80>] (handle_fasteoi_irq+0xc8/0x134)
[   63.088975] [<c01b5b80>] (handle_fasteoi_irq) from [<c01b0544>] (generic_handle_irq+0x34/0x44)
[   63.097634] [<c01b0544>] (generic_handle_irq) from [<c01b0c64>] (__handle_domain_irq+0xa0/0x11c)
[   63.106469] [<c01b0c64>] (__handle_domain_irq) from [<c010ac18>] (handle_IRQ+0x28/0x2c)
[   63.114520] [<c010ac18>] (handle_IRQ) from [<c0118af8>] (__ipipe_do_IRQ+0x38/0x40)
[   63.122136] [<c0118af8>] (__ipipe_do_IRQ) from [<c021d9cc>] (__ipipe_do_sync_stage+0x1c0/0x1f4)
[   63.130884] [<c021d9cc>] (__ipipe_do_sync_stage) from [<c021dac8>] (__ipipe_do_sync_pipeline+0xc8/0xcc)
[   63.140330] [<c021dac8>] (__ipipe_do_sync_pipeline) from [<c021e308>] (__ipipe_dispatch_irq+0x1d4/0x1f8)
[   63.149864] [<c021e308>] (__ipipe_dispatch_irq) from [<c0102664>] (__ipipe_grab_irq+0x74/0x8c)
[   63.158524] [<c0102664>] (__ipipe_grab_irq) from [<c010276c>] (gic_handle_irq+0x4c/0x88)
[   63.166660] [<c010276c>] (gic_handle_irq) from [<c0101f14>] (__irq_usr+0x54/0x80)
[   63.174180] Exception stack(0xd27d3fb0 to 0xd27d3ff8)
[   63.179260] 3fa0:                                     01271390 00000000 01281f20 b6252080
[   63.187480] 3fc0: 01281f18 01281d18 00000000 00000001 0008d000 00000000 00000008 00000008
[   63.195701] 3fe0: 0000ffff beec4648 01281f28 0002481a 80080030 ffffffff
[   63.202350] ---[ end trace 1f2efa44b0c3bbcd ]---

// with the ssh terminal showing:

echo "Running" /root/testBela/projects/sinetone/sinetone -v
Running /root/testBela/projects/sinetone/sinetone -v
sync& cd /root/testBela/projects/sinetone && /root/testBela/projects/sinetone/sinetone -v
Xenomai not explicitly inited
Xenomai is going to be inited by us
Bela_initAudio()
Starting with period size 16 ;analog enabled
DAC level 99999997952.000000 dB; ADC level 99999997952.000000 dB; headphone level 99999997952.000000 dB
could not open EEPROM for reading
Detected hardware: Bela
Hardware specified at the command line: NoHardware
Hardware specified in the user's belaconfig: NoHardware
Hardware to be used: Bela
Codec mode: 0 ()
fifoFactor: 1
core audioFrames: 16
Project name: sinetone
^Cmake: *** [Makefile:658: runonly] Interrupt

// those infinite line