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Date: Mon, 11 Jan 2021 10:36:51 +0100 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> Cc: Daniel Palmer <daniel@...f.com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Krzysztof Adamski <krzysztof.adamski@...ia.com>, Oleksij Rempel <o.rempel@...gutronix.de>, Baruch Siach <baruch@...s.co.il>, Russell King - ARM Linux <linux@...linux.org.uk>, Daniel Tang <dt.tangr@...il.com>, Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, Jamie Iles <jamie@...ieiles.com>, Barry Song <song.bao.hua@...ilicon.com>, Viresh Kumar <viresh.kumar@...aro.org>, Linus Walleij <linus.walleij@...aro.org>, Jonas Jensen <jonas.jensen@...il.com>, Marc Gonzalez <marc.w.gonzalez@...e.fr>, Hartley Sweeten <hsweeten@...ionengravers.com>, Lubomir Rintel <lkundrak@...sk>, Neil Armstrong <narmstrong@...libre.com>, Shawn Guo <shawnguo@...nel.org>, Alex Elder <elder@...aro.org>, Alexander Shiyan <shc_work@...l.ru>, Koen Vandeputte <koen.vandeputte@...ntric.com>, Hans Ulli Kroll <ulli.kroll@...glemail.com>, Vladimir Zapolskiy <vz@...ia.com>, Wei Xu <xuwei5@...ilicon.com>, Steven Rostedt <rostedt@...dmis.org>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Mark Salter <msalter@...hat.com>, Michael Ellerman <mpe@...erman.id.au>, Geert Uytterhoeven <geert+renesas@...der.be>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, linux-m68k <linux-m68k@...ts.linux-m68k.org> Subject: Re: Old platforms: bring out your dead Hi Adrian, On Mon, Jan 11, 2021 at 10:26 AM John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de> wrote: > On 1/11/21 10:20 AM, Geert Uytterhoeven wrote: > >> Sounds interesting. Do these SoCs come with an MMU? And do they use the > >> ColdFire instruction set or do they run plain 68k code? > > > > No MMU, plain m68k code. > > > > 68328 Soc = 68000 core + some peripherals, > > 68360 SoC = CPU32 core (based on 68020 + some peripherals. > > OK, I guess that would be useful for the NoMMU Linux port. Note that 68360 support was removed from the kernel in 2016, as Arnd said. > > Anyone working on integrating m68k (and SPARC and MIPS?) softcores in > > LiteX? ;-) > > I'm personally waiting for the Vampire to gain support for the real 68851 > as the hardware in general looks very attractive [1]. The 68851 is way too complex for what's needed (who needs support for 256 byte pages (https://lwn.net/Articles/839746/)?). They'd be better off implementing something simpler, like 68040 MMU support, or perhaps even a software-controlled TLB like most RISC architectures (incl. ColdFire?). The latter would require more changes to Linux, though. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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