i.MX6UL reference manual, Table 43-14. SDMA Data Memory Space shows:
RAM 0x0800 → 0x0FFF 8 Kbyte 8 Kbyte internal RAM with channels contexts and user data/routines
It look like the channel contexts require 32 channels x 32 words / channel x 4 byte / word = 4096 bytes of memory.
188.8.131.52 Context Switching-Programming
CONTEXT_BASE equals 0x0800
At which location inside the internal RAM are the contexts stored? Is CONTEXT_BASE the address on the data bus or the offset from the start of the RAM? Is CONTEXT_BASE a byte address (2048 bytes from start of RAM) or word address (8192 bytes from start of RAM)?
How much RAM is available for user scripts? Is any RAM in use by the NXP scripts for storing data (not code)?