Date: Sun, 20 Sep 2020 23:04:36 +0200 From: Klaus Cucinauomo <maciphone2@googlemail.com> To: Mark Millard <marklmi@yahoo.com>, Hans Petter Selasky <hps@selasky.org>, Robert Crowston <crowston@protonmail.com>, freebsd-arm@freebsd.org, myfreeweb <greg@unrelenting.technology> Subject: Re: Comment #135 for bugzilla 237666 : a USB3-handling problem with a investigatory fix for a cortex-a72 context Message-ID: <89DE47B7-6A18-4FE7-BADB-755A3268C19E@googlemail.com> In-Reply-To: <9A82725E-CE5C-4AD5-96D7-D04335DF9B23@yahoo.com> References: <6E618C3D-12DF-429E-A249-5BAB90FC6B15.ref@yahoo.com> <723E6915-94F5-417C-B4AF-EEEBFBDF6162@yahoo.com> <565258A0-BEE1-48F8-9851-E6C7CF7ADAE7@yahoo.com> <D28FEE99-A2CA-484E-A5E9-312334CF3FE3@yahoo.com> <75af04ec-0021-3575-40bf-c5ab9b6d4703@selasky.org> <CE9D7856-0179-4C9B-8367-AFBD8EAD4CC2@yahoo.com> <9cf87718-9d4a-60ca-004f-5818371c937b@selasky.org> <47D6CA1E-F842-47B6-97E0-C87B33610C64@yahoo.com> <8BAF3798-4BB4-4C5E-87FC-ECD1458910A2@yahoo.com> <7_E2XXmpIwdiLPwD5tkXUAFlHsAhrFIbs87-JJnE57wRg4vrRcqCL1qSToBN_52_YjcPvt7HQSrzA0v6fWDAYIoN348pYVc62bTUXNxudBU=@protonmail.com> <3D0CFAD6-A93B-401E-82CD-831E22BD8D7A@yahoo.com> <486e827b-b868-abe1-0ac9-478227779a63@selasky.org> <8E916B11-83AB-4045-A501-8F64AD93AF8A@googlemail.com> <473332B8-B0BC-41BB-A36F-500B9416BFBB@yahoo.com> <B02E6A40-0901-47B6-AAEA-3941D1091D33@googlemail.com> <9A82725E-CE5C-4AD5-96D7-D04335DF9B23@yahoo.com>
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> Am 20.09.2020 um 22:33 schrieb Mark Millard <marklmi@yahoo.com>: >=20 >=20 >=20 > "OpenBSD can deal with the 3GB limit. In fact it imposes a 1GB DMA = limit because there are additional DMA restrictions for the SD = controller." ( Mark Kettenis Aug 24, 2020; 4:29am Re: Discuss UEFI = settingsin arm64.html/INSTALL.arm64 ) >=20 >=20 =E2=80=94=E2=80=94 Mark Kettenis Thu, 16 Apr 2020 14:06:19 -0700 :--- Still thinking about the best approach to deal with this. There is a 1GB limit as well for the "GPU" devices such as the USB 2.0 and SDHC controllers. So it's either setting the DMA constraint to 3GB and adding a bounce buffer implementation, or setting the DMA constraint to 1GB. =E2=80=94--- Well, Mark(Millard:-) , there seems to be a magician in the background and I don=E2=80=99t know = why=20 but that guy is always exactly following =E2=80=9Emy=E2=80=9C = =E2=80=9Einstructions" :-) Ha Ha, lol awesome : .. here we go: ------ https://reviews.freebsd.org/D26493 https://reviews.freebsd.org/D26494 https://reviews.freebsd.org/D26495 https://reviews.freebsd.org/D26496 .. https://reviews.freebsd.org/rS365929 .. Regards K.
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