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charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-drivers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Writing device drivers for FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Oct 2018 08:23:32 -0000 Hi, I have an AMD eMMC 5.0 controller connected to an eMMC device. I recently got around to enabling HS400 mode but the performance is still s= ame what I was getting in HS200 mode. Is there a way to verify the HS400 mode is active? Patch for enabling HS400: https://reviews.freebsd.org/D17644 In order to enable the HS400 mode I had to clear the Sampling clock select = bit (Host control 2 register) and then set it later (as part of the patch). Now, I suspect that this led to reset of the tuning circuit and that even t= hough HS400 mode is enabled, since it is not tuned, I do not see increase i= n performance. Could that be a possibility? There is a similar patch for linux and I've tried it, it works on my board = with HS400 mode (~200 MB/s), measured using iozone. Linux patch: https://patchwork.kernel.org/patch/10086747/ Thanks Shreyank Amartya