From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Korsgaard Date: Fri, 23 Sep 2016 08:50:00 +0200 Subject: [Buildroot] [PATCH 1/1] configs: new defconfig for TI am335x-evm In-Reply-To: (Lothar Felten's message of "Fri, 23 Sep 2016 00:21:42 +0200") References: <1471261882-5640-1-git-send-email-lothar.felten@gmail.com> <20160918193045.15a33be3@free-electrons.com> <87fuotya3r.fsf@dell.be.48ers.dk> <20160921105303.1832ad5e@free-electrons.com> <87bmzhy6ci.fsf@dell.be.48ers.dk> <20160921121803.487035d8@free-electrons.com> <877fa5y1y2.fsf@dell.be.48ers.dk> <20160921140912.29c4584e@free-electrons.com> Message-ID: <87eg4bnm93.fsf@dell.be.48ers.dk> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net >>>>> "Lothar" == Lothar Felten writes: Hi, > I changed the patches, they now update the current beaglebone, the > defconfigs will be: beaglebone_defconfig and beaglebone_qt_defconfig. > The readme.txt lists the supported targets. Ok, great! >>> Uboot SD card patch: >>> Early AM335x-evm boards can only use 1 bit communication to the SD card, on >>> newer board revisions this might be fixed. >>> Forcing 1 bit communication slows down the communication but will work >>> regardless if the SD card is attached via 1 or 4 bits. >>> If the board has a working 4 bit SD card interface, this patch can be removed, >>> this will speed up the access. >> >> Do you still have those early AM335x EVM boards? Are they widespread? >> I'm wondering if it really makes sense to have this patch. > I've only use two EVMs and they both have the issue, I'm not sure that > it ever got fixed. Any board will run in 1 bit mode, but some evms > won't run in 4 bit mode, so I think that's a safe choice. Anyway, it > applies to the uboot only. What is the upstream status of this? Have you discussed it on the u-boot list? Right now, this is a hack that isn't suitable for upstream, but how about tweaking omap_hsmmc host_cap if we are running on the evm? As it stands, the beaglebone boards are also forced into 1bit mode even though they don't have the problem. >> Does this really work for the BeagleBone, which uses ttyO2 if I >> remember correctly? Maybe another reason to have a defconfig that >> supports just the am335x_evm. > The beaglebone (ttyO0 on USB) beagleboneblack (ttyO0 on pinheader) and > the evm (sub d 9 pin) all use ttyO0 Ok, great! -- Venlig hilsen, Peter Korsgaard