Date: Thu, 18 Apr 2019 08:25:09 -0600 From: Ian Lepore <ian@freebsd.org> To: Balanga Bar <balanga.bar@gmail.com> Cc: freebsd-arm@freebsd.org Subject: Re: loaderdev Message-ID: <26ead64e0e79f5d8f9c882273142dc09d95417a7.camel@freebsd.org> In-Reply-To: <CADocevCOY%2BkgKCg8mcjnKZ-HbuTKfBvmm8DTEnWEa2e505kQTw@mail.gmail.com> References: <CADocevCdU6FwXVtJsTY54LTi6FHaqSAzLUZWaTw8QgEHs9v%2BSA@mail.gmail.com> <a0660f746d4634258fc24981887b166e7a84f90b.camel@freebsd.org> <CADocevCOY%2BkgKCg8mcjnKZ-HbuTKfBvmm8DTEnWEa2e505kQTw@mail.gmail.com>
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On Thu, 2019-04-18 at 09:30 +0100, Balanga Bar wrote: > How does uBoot know how to load ubldr? Is this specific to a particular > version of uBoot? I'm using a customised uBoot which lets me boot OpenWrt, > Debian, Arch Linux or FreeBSD depending on the contents of a USB stick. > > Currently I have a /boot/uEnv.txt file on a FAT partition which includes > > bootfile=ubldr > > Will I no longer need a FAT partition? > > If loaderdev is set to disk, then where is ubldr loaded from since, AFAIK, > uBoot can only read FAT or EXT3 partitions? > The convention for freebsd mailing lists is to bottom-post replies, mixed top and bottom posting makes for unreadable threads. The loaderdev variable is not used by uboot at all, it is read from the uboot environment by ubldr. Basically, loaderdev just gives you a way to control where ubldr finds the kernel by setting a uboot env var (interactively or via uenv.txt). You arrange to have uboot load ubldr in whatever way you're currently doing, so you will still need a FAT partition, because uboot can't read UFS filesystems. -- Ian
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