Date: Thu, 8 Oct 2020 13:14:42 -0500 From: Kyle Evans <kevans@freebsd.org> To: Mitchell Horne <mhorne@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, svn-src-head <svn-src-head@freebsd.org> Subject: Re: svn commit: r366542 - in head/sys: amd64/amd64 arm/arm arm64/arm64 kern riscv/riscv sys Message-ID: <CACNAnaFpjo=Xvd1_rjqQ%2Bb1VC9ump_xq9ySEbB4jOhrTyM_36w@mail.gmail.com> In-Reply-To: <202010081802.098I26Rq052294@repo.freebsd.org> References: <202010081802.098I26Rq052294@repo.freebsd.org>
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On Thu, Oct 8, 2020 at 1:02 PM Mitchell Horne <mhorne@freebsd.org> wrote: > > Author: mhorne > Date: Thu Oct 8 18:02:05 2020 > New Revision: 366542 > URL: https://svnweb.freebsd.org/changeset/base/366542 > > Log: > Add a routine to dump boot metadata > > The boot metadata (also referred to as modinfo, or preload metadata) > provides information about the size and location of the kernel, > pre-loaded modules, and other metadata (e.g. the EFI framebuffer) to be > consumed during by the kernel during early boot. It is encoded as a > series of type-length-value entries and is usually constructed by > loader(8) and passed to the kernel. It is also faked on some > architectures when booted by other means. > > Although much of the module information is available via kldstat(8), > there is no easy way to debug the metadata in its entirety. Add some > routines to parse this data and allow it to be printed to the console > during early boot or output via a sysctl. > > Since the output can be lengthly, printing to the console is gated > behind the debug.dump_modinfo_at_boot kenv variable as well as the > BOOTVERBOSE flag. The sysctl to print the metadata is named > debug.dump_modinfo. > Hi, Why both a tunable and boot -v? The tunable is already specifically scoped to just this operation, it seems a little odd to double-gate it. Thanks, Kyle Evans
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