Date: Mon, 20 Aug 2018 19:13:16 +0200 From: Marcin Wojtas <mw@semihalf.com> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: arm@freebsd.org Subject: Re: Importing DTS for arm64 Message-ID: <CAPv3WKdnLLk-RXqCWEsEvcV%2B=ychtmqcp16xhTzD7i_p5B1LzA@mail.gmail.com> In-Reply-To: <20180820171150.cc8e08114a1d9553da6056f9@bidouilliste.com> References: <20180820171150.cc8e08114a1d9553da6056f9@bidouilliste.com>
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Hi Manu, +1 to the idea. It gives more options to the users. pon., 20 sie 2018 o 17:12 Emmanuel Vadot <manu@bidouilliste.com> napisa=C5= =82(a): > > > Hello arm@ > > I would like to import the DTS for arm64 in the tree and use them like > we do for the arm ones. We currently rely on the bootloader/firmware to > give us a DTB to work with, this works nicely until it doesn't. Here is > why I want to import the DTS : > > - Most of the boards are using U-Boot, u-boot embed a DTB that isn't > compiled with -@ (overlay ready) so we cannot use overlays. We want > overlays, overlays are nice. > - The DTS life is going to linux, then sometimes it's imported in > U-Boot but it depend on the SoC family, U-Boot doesn't batch import > every DTS like we do. So sometimes to U-Boot DTS are very old. Or when > an interesting patch in commited upstream it is in Linux X+2 (roughly 4 > months from now), we then have to wait for U-Boot to catch up, that > give us between 4 and 6 months to have an update. > - Some boards like the Marvell ones have 3 DTS, the one in the > vendor U-Boot made by Marvell themselves, the one in u-boot mainline > and the one in Linux. There is 4th - UEFI, but it's aligned with most recent Linux + some minimal improvements (e.g. big PCIE windows). I recommend using Macchiato with this kind of firmware instead of U-Boot. Best regards, Marcin > I found that the DTS in the Marvell U-Boot have > some problem with FreeBSD (especially the macchiatobin that declare > node with the same address but not the same size, that is not something > that the rman code can handle, it could be modified, I don't know the > code well enough). Also some compatible are used when they shouldn't, > for example they declare the gpio being orion-gpio while this binding > requires interrupts supports, which the node doesn't have. > - The above situation is mostly the same with RockChip SoCs (possibly > others, those are the only SoCs I work on that have this problem). > > Note that importing the DTS doesn't mean that every board will use > them, I don't intend to copy the DTB to the GENERIC memstick image for > the Overdrive 1000/3000 for example, the ones provided by the firmware > works fine. > RPI3 will still stay an exception as we use the DTB provided by the > rpi-firmware package, so they come from the rpi foundation linux fork. > > I would love to do that for 12 even if we are approching code freeze, > this will allow FreeBSD 12 to be more than awesome on arm64. > > Cheers, > > -- > Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org> > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org"
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