Date: Thu, 28 Jan 2016 09:44:50 +0100 From: Norbert Koch <nkoch@demig.de> To: <freebsd-hackers@FreeBSD.org> Subject: impossible to set pata dma mode? Message-ID: <56A9D502.7010809@demig.de>
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Hello. I have to reduce dma mode from udma to wdma2 for a flash device. In the past this was easy using atacontrol but, afaiks it seems to be impossible using camcontrol. camcontrol negotiate ada0 -M wdma ...You can only modify user parameters camcontrol negotiate ada0 -NM wdma Works, but I see no way how those user parameters become active parameters as the driver only reads then in attach as far as I can see. It seems like the ata driver's interface allows to change the current settings (XPT_SET_TRAN_SETTINGS/CTS_TYPE_CURRENT_SETTINGS) so, why is camcontrol so restrictive? Thank you, Norbert Koch
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