quoted

You can devmem 0xF2400240(Device ID Status Register).
#define A8040_B0_DEVICE_ID      0x8045
#define A8040_AX_DEVICE_ID      0x8040
#define A7040_B0_DEVICE_ID      0x7045
#define A7040_AX_DEVICE_ID      0x7040
#define A3900_A1_DEVICE_ID      0x6025
#define CN9130_DEVICE_ID        0x7025

Thanks. 0x00028040, so it's AX silicon. Is there nothing that can be done for
flow control on that?

No, we cannot support FC with AX on A8040.
 

It would probably also be a good idea to state this requirement in the
message as well, rather than just suggesting the firmware revision.

Ok, I would update this.

Thanks,
Stefan.