I have an in-depth question regarding the behaviour of the rt2560 mac controller
When setting 802.11g OFDM modes (12M,24M,36M,48M,54M) with "iwconfig ra0 rate xy fixed"
If a unicast frame transmission is not successful (ACK timeout for whatever reason) the following MAC retransmissions are always done at [bgrqru2l4]the next lower OFDM mode[/bgrqru2l4].
AFAIK this (quite smart) feature is not part of the IEEE standard spec, for our measurement testbed we need a way to turn it off i.e. strictly fixing the rate is what we want
So this is not about setting the OFDM rates that are used in the first place, we need to turn off the "retransmission-rate-fallback" feature.
I am already quite familiar with the driver source and my guess is that changing a BBP or CSR register value could do the trick but until now I was not able to pull it off.....
is somebody hanging around here who has more indepth-info on the rt2560 mac controller?
HW rt2500 pci 802.11b/g based model MSI PC54G2 with RT2560F
every hint is [igrqru2l4]greatly[/igrqru2l4] appreciated
greetings from Austria!
Forschungszentrum Telekommunikation Wien