The LPM demo for MCU_Only mode is crashing even before the LPM mode & booting Linux fails at the ATF stage.

Crash:

NOTICE:  BL31: v2.10.0(release):v2.10.0-367-g00f1ec6b87-dirty
NOTICE:  BL31: Built : 16:09:05, Feb  9 2024
ERROR:   Timeout waiting for thread SP_RESPONSE to fill
ERROR:   Thread SP_RESPONSE verification failed (-60)
ERROR:   Message receive failed (-60)
ERROR:   Failed to get response (-60)
ERROR:   Transfer send failed (-60)
ERROR:   Timeout waiting for thread SP_RESPONSE to fill
ERROR:   Thread SP_RESPONSE verification failed (-60)
ERROR:   Message receive failed (-60)
ERROR:   Failed to get response (-60)
ERROR:   Transfer send failed (-60)
ERROR:   Unable to query firmware capabilities (-60)
I/TC: 
I/TC: OP-TEE version: 4.2.0-dev (gcc version 13.3.0 (GCC)) #1 Fri Apr 12 09:51:21 UTC 2024 aarch64
I/TC: WARNING: This OP-TEE configuration might be insecure!
I/TC: WARNING: Please check https://optee.readthedocs.io/en/latest/architecture/porting_guidelines.html
I/TC: Primary CPU initializing
I/TC: GIC redistributor base address not provided
I/TC: Assuming default GIC group status and modifier
E/TC:0 0 k3_sec_proxy_verify_thread:108 Queue is busy
E/TC:0 0 k3_sec_proxy_recv:196 Thread SEC_PROXY_RESPONSE_THREAD verification failed. ret = -65523
E/TC:0 0 ti_sci_get_response:101 Message receive failed (-65523)
E/TC:0 0 ti_sci_do_xfer:150 Failed to get response (-65523)
E/TC:0 0 ti_sci_init:486 Unable to communicate with control firmware (-65523)
E/TC:0 0 call_initcalls:43 Initcall __text_start + 0x00070b10 failed
E/TC:0 0 k3_sec_proxy_verify_thread:108 Queue is busy
E/TC:0 0 k3_sec_proxy_recv:196 Thread SEC_PROXY_RESPONSE_THREAD verification failed. ret = -65523
E/TC:0 0 ti_sci_get_response:101 Message receive failed (-65523)
E/TC:0 0 ti_sci_do_xfer:150 Failed to get response (-65523)
E/TC:0 0 k3_sec_proxy_verify_thread:108 Queue is busy
E/TC:0 0 k3_sec_proxy_recv:196 Thread SEC_PROXY_RESPONSE_THREAD verification failed. ret = -65523
E/TC:0 0 ti_sci_get_response:101 Message receive failed (-65523)
E/TC:0 0 ti_sci_do_xfer:150 Failed to get response (-65523)
E/TC:0 0 k3_sec_proxy_verify_thread:108 Queue is busy
E/TC:0 0 k3_sec_proxy_recv:196 Thread SEC_PROXY_RESPONSE_THREAD verification failed. ret = -65523
E/TC:0 0 ti_sci_get_response:101 Message receive failed (-65523)
E/TC:0 0 ti_sci_do_xfer:150 Failed to get response (-65523)
E/TC:0 0 tee_otp_get_hw_unique_key:97 Could not get HUK
E/TC:0 0 call_initcalls:43 Initcall __text_start + 0x00070b38 failed
E/TC:0 0 k3_sec_proxy_verify_thread:108 Queue is busy
E/TC:0 0 k3_sec_proxy_recv:196 Thread SEC_PROXY_RESPONSE_THREAD verification failed. ret = -65523
E/TC:0 0 ti_sci_get_response:101 Message receive failed (-65523)
E/TC:0 0 ti_sci_do_xfer:150 Failed to get response (-65523)
E/TC:0 0 sa2ul_init:61 Failed to get SA2UL device
E/TC:0 0 call_initcalls:43 Initcall __text_start + 0x00070b40 failed
E/TC:0 0 
E/TC:0 0 Core data-abort at address 0x14 (translation fault)
E/TC:0 0  esr 0x96000005  ttbr0 0x9e8a2000   ttbr1 0x00000000   cidr 0x0
E/TC:0 0  cpu #0          cpsr 0x600003c4
E/TC:0 0  x0  000000009e875000 x1  0000000000000000
E/TC:0 0  x2  0000000000000000 x3  0000000000000000
E/TC:0 0  x4  0000000000000050 x5  000000009e892d70
E/TC:0 0  x6  ffffffffffffffb0 x7  0000000000010cb0
E/TC:0 0  x8  0000000000010cb0 x9  000000009e892f80
E/TC:0 0  x10 000000009e882070 x11 0000000000000008
E/TC:0 0  x12 0000000000000000 x13 000000009e8a3e60
E/TC:0 0  x14 0000000000000000 x15 0000000000000000
E/TC:0 0  x16 000000009e81cc5c x17 0000000000000000
E/TC:0 0  x18 0000000000000000 x19 000000009e8a41e0
E/TC:0 0  x20 000000009e8a41e8 x21 000000009e875000
E/TC:0 0  x22 000000009e875000 x23 000000009e875f00
E/TC:0 0  x24 000000009e874dc0 x25 0000000000000000
E/TC:0 0  x26 0000000000000000 x27 0000000000000000
E/TC:0 0  x28 0000000000000000 x29 000000009e8a4170
E/TC:0 0  x30 000000009e81741c elr 000000009e81742c
E/TC:0 0  sp_el0 000000009e8a4170
E/TC:0 0 TEE load address @ 0x9e800000
E/TC:0 0 Call stack:
E/TC:0 0  0x9e81742c
E/TC:0 0  0x9e807ca0
E/TC:0 0  0x9e8225fc
E/TC:0 0  0x9e807e9c
E/TC:0 0 Panic 'unhandled pageable abort' at /usr/src/debug/optee-os/4.2.0+git/core/arch/arm/kernel/abort.c:582 <abort_handler>
E/TC:0 0 TEE load address @ 0x9e800000
E/TC:0 0 Call stack:
E/TC:0 0  0x9e80817c
E/TC:0 0  0x9e81f0c0
E/TC:0 0  0x9e807884
E/TC:0 0  0x9e804a68

Resolution:
Create a separate task for
sciserver with highest task priority

Root Cause:
Linux load fails with lpm_example_freertos because
while booting linux kernel, tisci/sciclient calls
are not processed by DM.
This is because sciserver task running on DM doesn't
process the task with high priority resulting in failure
in linux side.