ARM Cortex-A8 is a quite old CPU , v7-A architecture.
Does FreeRTOS support for this particular CPU (or family of such SoC)?
I am pretty sure there are a number of ports for v7-A processors in the portable directory. The issue would be to adapt one for that particular processor, as there isn’t the same commonality in the A series of things like NVIC and Timers like the Cortex-M series which allows for very generic base ports.
Search for “Cortex-A” on this page to find A7, 8 and 9 ports that be compatible, as far as the core is concerned (exception things like the VIC as per richard-d’s post).