Date: Mon, 11 Apr 2016 21:16:39 -0700 From: Russell Haley <russ.haley@gmail.com> To: Emb Aud <embaudarm@gmail.com> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: More questions RE: booting FreeBSD on Zynq Message-ID: <CABx9NuTgNh2WOmT1nJJX1uM1Q-iKz7b5j%2BDUg2RZ%2BsxexFnVvQ@mail.gmail.com> In-Reply-To: <CANC_bnMwG2sHirgx2jBJ7q7=bCOeuJ4gJ2oiih8L9VcoB993Yw@mail.gmail.com> References: <CANC_bnMwG2sHirgx2jBJ7q7=bCOeuJ4gJ2oiih8L9VcoB993Yw@mail.gmail.com>
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I found this helpful as a starting point: http://www.devicetree.org/Device_Tree_Usage Here's the wiki link, but I don't know how current the information is: https://wiki.freebsd.org/FlattenedDeviceTree * Lots of good resources at the bottom of the page too. *note: The page says that the default location for fdt files in "sys/boot/fdt/dts" but I think most of them are now found in "/src/sys/gnu/dts". One of the developers said they refresh the files from the gnu/linux tree every now and then. Cheers, Russ On Mon, Apr 11, 2016 at 5:33 PM, Emb Aud <embaudarm@gmail.com> wrote: > Hi Everyone. I'm still working on my FreeBSD boot configuration for Zynq. > Thanks to those how have helped me thus far. > > Could you all help point in the right direction in regards to a few things? > > 1. I've decided that I don't want to use U-Boot. So I'm going to have to > bootstrap the kernel myself. Do you guys think it would be easier to load > the kernel directly or to load the kernel using ubldr? The catch being > that ubldr apparently requires emulating some u-boot API functionality. > > 2. Can someone help me understand the role of the device tree? I get that > it describes the hardware memory locations. What I'm a little fuzzy on is > at what point during the boot process it is used. Is it used by u-boot? > Is it used by the kernel? If it's used by the kernel, how does the kernel > know where to find it? > > 3. Is there any support for using QSPI flash as a filesystem? I am going > to be booting out of QSPI because the SD-Card is not going to be available > as a boot device. I'd like to keep the entire boot process in QSPI if I > can. > > 4. I've been looking at ubldr, trying to figure out how to build it by > itself... Just so I can get a good look at what files are involved. What > is the proper way to run "make" in a subdirectory of the source tree? > Everything that I've tried so far has resulted in errors. > > Thank you. > _______________________________________________ > 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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