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Subject: Re: remove arch/sh
From:   "D. Jeff Dionne" <djeffdionne@gmail.com>
In-Reply-To: <c9ce648e-e63e-8a47-03c6-7c7e30d8dbc7@roeck-us.net>
Date:   Tue, 17 Jan 2023 19:10:25 -0500
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Rob Landley <rob@landley.net>, Christoph Hellwig <hch@lst.de>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arch@vger.kernel.org,
        dmaengine@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-renesas-soc@vger.kernel.org, linux-i2c@vger.kernel.org,
        linux-input@vger.kernel.org, linux-media@vger.kernel.org,
        linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org,
        netdev@vger.kernel.org, linux-gpio@vger.kernel.org,
        linux-rtc@vger.kernel.org, linux-spi@vger.kernel.org,
        linux-serial@vger.kernel.org, linux-usb@vger.kernel.org,
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        linux-sh@vger.kernel.org
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References: <20230113062339.1909087-1-hch@lst.de>
 <11e2e0a8-eabe-2d8c-d612-9cdd4bcc3648@physik.fu-berlin.de>
 <20230116071306.GA15848@lst.de>
 <9325a949-8d19-435a-50bd-9ebe0a432012@landley.net>
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 <c9ce648e-e63e-8a47-03c6-7c7e30d8dbc7@roeck-us.net>
To:     Guenter Roeck <linux@roeck-us.net>
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> Since there are people around with real hardware .... is sh in big =
endian mode
> (sheb) real ? Its qemu support is quite limited; most PCI devices =
don't work
> due to endianness issues. It would be interesting to know if this =
works better
> with real hardware.

Hi Guenter,

SH big endian works very well, and is in use on J-Core J2 SMP (hardware =
w/FPGA, simulation and ASIC this year) as well as some of the Hitachi / =
Renesas IoT chips e.g. SH7619.

It=E2=80=99s the base of the real new line of development (as opposed to =
backward looking support of older SH chips).  New chipsets will be based =
on the same RTL.

But does it actually work?  Yes, we have (new) devices such as a USB =
Wireguard based VPN hardware dongle, that are J2 (SH2 2 core SMP) that =
are in use with Linux sheb, nommu and fdpic.  MMU chips will be little =
endian.

Cheers,
J.

> Thanks,
> Guenter
>=20