From mboxrd@z Thu Jan 1 00:00:00 1970 From: linus.ml.walleij@gmail.com (Linus Walleij) Date: Wed, 7 Jul 2010 14:32:43 +0200 Subject: [PATCH 1/3] ARM: driver for the character LCD found in ARM refdesigns In-Reply-To: References: <1278429668-4564-1-git-send-email-triad@df.lth.se> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 2010/7/7 Colin Tuckley : >> The 4bit mode is the only one that seems to work. I tried putting >> the display into 8bit mode and failed miserably. > > I've had a check with the hardware guys. Our self-test software uses the > 4-bit mode, the 8-bit mode is untested. OK I can make another round. I modeled the 4bit mode after the ROM selftest actually. The phenomenon is like commands go through in 8bit but not characters, so whatever you write into CHAR_DAT only the 4 higher bits go through, often with the effect of letters like "@@@@@" in the display (if you write something with big letters). >> The IRQ is stated in the reference manual as "don't use" because it >> is "reserved for future use" but I implemented it anyway. > > The answer seems to be that "future use" means "for an OS". Aha OK, then it's all mine! :-) Yours, Linus Walleij