On-chip RAM unavailable over JTAG

There is a VERY SIMPLE example how to create and start a HPS based "Hello World" app on Cyclone V SOC : https://www.intel.com/content/www/us/en/programmable/documentation/lro1424280108409.html

Debugging is connected over USB-Blaster.

Unfortenutely the debug step fails for both GCC abd DS-5 based apps. The app cannot be loaded into OCRAM (on LARK board and custom HW):

loadfile "C:\FPGA\ws_arm\at_tst\Debug\at_tst.axf"
Target Message: Memory access caused precise abort.
Debug Precise Abort Registers : DFSR = 0x00000817, DFAR = 0x00100FE0
ERROR(CMD16-TAD274-NAL18): 
! Failed to load "at_tst.axf"
! Failed to write 17.504 bytes to address S:0x00100000 while writing block of 4.096 bytes to address S:0x00100000
! Bus error on memory operation.
set debug-from main
start
WARNING(CMD399-COR168): 
! Failed to start the target
! No function named "main" could be found
WARNING(CMD407): Trying the entry point instead
ERROR(CMD426): Cannot find symbol to start or entrypoint, the file or load commands may be used to set the entrypoint
wait

Debugger can access only in the range 0xFFFF0000-0xFFFF1FFF beginning with 0xFFFF2000 the OCRAM becomes unaccessible.

Just a simple test:

memory set_typed S:0xFFFF2000 (unsigned int) (0)
Target Message: Memory access caused precise abort.
Debug Precise Abort Registers : DFSR = 0x00000817, DFAR = 0xFFFF2000
ERROR(TAD11-NAL18): 
! Failed to write 4 bytes to address S:0xFFFF2000
! Bus error on memory operation

Memory view:

The problem seems to be not new, but the solution ...