Le Tue, 22 Mar 2022 13:35:08 +0100, Clément Léger clement.leger@bootlin.com a écrit :
Le Tue, 22 Mar 2022 11:18:39 +0000, Eugen.Hristev@microchip.com a écrit :
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Could not initialize timer (err -22)
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Could you investigate this please ?
Hi Eugen,
Ok, I'll try to debug that !
Hi Eugen, while debugging it, I found that there was actually one major flaw. The clock that I used was the GLCK. If only this clock is enabled, the TCB can not work, the tcb0_clk must also be enabled for the TCB to start counting. It worked on my side because I forgot that I had a quirk in OP-TEE that was enabling the clocks before starting U-Boot. Without that, it actually could not work.
Since the tcb0_clk is needed, I switched the driver to use this one only and it works well on a "bare" setup (ie without OP-TEE). I even think it could not work with the tcb0_gclk since this one does not correctly handles the case when the parent clock is the slow_clk (which might be the case after booting) and in this case, will return 0 as rate (this is by the way supported in your CCF branch).
Anyway, I fixed the driver to use the tcb0_clk and thus it should work much better. I will send a V8 and it should work with U-Boot and the SPL.
By the way, do you have any documentation which explains how to use U-Boot SPL on sama5d2_xplained (or other) board ?
Regards,
Clément.