Date: Thu, 13 Feb 2020 15:26:15 +0100 From: Ralf Wenk <iz-rpi03@hs-karlsruhe.de> To: Kyle Evans <kevans@freebsd.org> Cc: Mark Millard <marklmi@yahoo.com>, freebsd-arm <freebsd-arm@freebsd.org>, Oleksandr Tymoshenko <gonzo@freebsd.org>, Andrew Turner <andrew@freebsd.org>, Emmanuel Vadot <manu@freebsd.org> Subject: Re: A investigative hack that makes (for example) head -r356529 boot and operate normally an RPi4B (finally!): protect all armstub8-gic.bin's loaded content from replacement by the kernel Message-ID: <E1j2FRX-000MyR-1O@iz-wera-new.HS-Karlsruhe.DE> In-Reply-To: <CACNAnaHVYeuoK=4f7XzokpAVjcqd6ovD58-0LdP_vPGjiXQgdw@mail.gmail.com> References: <7E7605DC-021D-448A-8459-8EC26BA9836D@yahoo.com> <E1j2EmR-000Mwm-ID@iz-wera-new.HS-Karlsruhe.DE> <CACNAnaHVYeuoK=4f7XzokpAVjcqd6ovD58-0LdP_vPGjiXQgdw@mail.gmail.com>
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On 2020-02-13 at 7:49 -0600 Kyle Evans wrote:
> On Thu, Feb 13, 2020 at 7:43 AM Ralf Wenk <iz-rpi03@hs-karlsruhe.de> wrote:
> >
> > On 2020-02-12 at 18:00 -0800 Mark Millard wrote via freebsd-arm:
> > > [...]
> > >
> > > # svnlite diff /usr/src/sys/dev/fdt/fdt_common.c
> > > Index: /usr/src/sys/dev/fdt/fdt_common.c
> > > ===================================================================
> > > --- /usr/src/sys/dev/fdt/fdt_common.c (revision 357529)
> > > +++ /usr/src/sys/dev/fdt/fdt_common.c (working copy)
> > > @@ -485,7 +485,18 @@
> > >
> > > tuples = res_len / tuple_size;
> > > reservep = (pcell_t *)&reserve;
> > > +#ifdef __aarch64__
> > > + //HACK!!!
> > > + // Reserve the first few pages, for example to
> > > + // preserve armstub8-gic.bin or armstub.bin
> > > + // content.
> > > + mr[0].mr_start= 0;
> > > + mr[0].mr_size= 2*4096;
> > > + tuples++;
> > > + for (i = 1; i < tuples; i++) {
> > > +#else
> > > for (i = 0; i < tuples; i++) {
> > > +#endif
> > >
> > > rv = fdt_data_to_res(reservep, addr_cells, size_cells,
> > > (u_long *)&mr[i].mr_start, (u_long *)&mr[i].mr_size);
> > > @@ -512,6 +523,11 @@
> > >
> > > root = OF_finddevice("/reserved-memory");
> > > if (root == -1) {
> > > + // Fail over to checking for and handling memreserve,
> > > + // such as for a RPi4B.
> > > + if (0 == fdt_get_reserved_regions(reserved,mreserved))
> > > + return (0);
> > > +
> > > return (ENXIO);
> > > }
> > >
> >
> > I can confirm that with your patch(es) my RPi3 does not freeze any more
> > when loading mac_ntpd.ko. The patches are applied against r357853M.
> >
>
> Have you tested the RPi3 with just this second hunk of patch to
> fallover to memreserve, or is the first hunk definitely required as
> well?
Good question. I tested both hunks together.
Will try what happens when just applying the second and report back.
It is possible that those changes are not enough to get a stable working
system. Because while doing make installworld with r357853 and both hunks
applied the following just happens:
install -N /usr/src/etc -o root -g wheel -m 444 ng_async.4.gz
//usr/share/man/man4/
*** Signal 11
Ralf
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