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Sipos Csaba sipos.csaba at kvk.uni-obuda.huThanks mate, with your patch its working all right :-) With Tom, we talked about a feature wich would be nice to have: a 10ms trigger so we can see something like this: http://tsou.cc/lte/openlte-spectro.png What do you think about it? Regards, Csaba ----- Original Message ----- From: "Sylvain Munaut" <tnt at 246tnt.com> To: "Sipos Csaba" <sipos.csaba at kvk.uni-obuda.hu> Cc: osmocom-sdr at lists.osmocom.org, "Sylvain Munaut" <tnt at 246tnt.com> Sent: Friday, February 27, 2015 11:19:06 AM Subject: Re: gr-fosphor: error: work group size exceeds the maximum default value for the selected device (AMD HD 5450) Hi, > I just compiled gr-fosphor on a PC equipped with a HD 5450 card, and when I try to run osmocom_fft -F I gut the following error: > [+] Selected device: Cedar > Build log for 'display.cl': > "/tmp/OCL2287T8.cl", line 67: error: work group size exceeds the maximum > default value for the selected device > __attribute__((reqd_work_group_size(16, 16, 1))) > ^ > > 1 error detected in the compilation of "/tmp/OCL2287T8.cl". > Frontend phase failed compilation. Yes, that card only suppot 128 as a maximum work group size and fosphor is written to use 256. I think this particular generation of card is the only one that's new enough to support OpenCL but old enough to not support WG of 256. I did however write a patch to support it a while back and just never bothered to clean it up (to select size dynamically depending on your card). Try the attached patch and see if it works for you. Cheers, Sylvain