Date: Wed, 18 Mar 2015 20:16:55 +0200 From: Guy Yur <guyyur@gmail.com> To: Hellmuth Michaelis <hm@hellmuth-michaelis.de> Cc: freebsd-arm@freebsd.org Subject: Re: beaglebone boot from eMMC Message-ID: <CAC67Hz_ssdAHoRFqC7VAR9_XvTchc5DNhKPY4=LstcMx3j9NXw@mail.gmail.com> In-Reply-To: <3EF47A05-60B2-4BB0-8688-018E50CF7D4A@hellmuth-michaelis.de> References: <3DF08C65-20E3-4524-B0E1-C5C096AA0FE8@hellmuth-michaelis.de> <54BA6DB9-DC61-4A6F-B948-777BB9800F54@bocal.org> <A923E8B5-72DC-4C19-B5CA-7729C7E16A5C@hellmuth-michaelis.de> <20150312132739.GA28385@cicely7.cicely.de> <A3E0A638-450D-4B83-90F7-090D45FF4420@bsdimp.com> <3EF47A05-60B2-4BB0-8688-018E50CF7D4A@hellmuth-michaelis.de>
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Hi, On Wed, Mar 18, 2015 at 9:23 AM, Hellmuth Michaelis <hm@hellmuth-michaelis.de> wrote: > > Its really weird. I fetched the Angstroem flasher to put back an original= image onto the eMMC and that worked. I dumped the MBR for Linux and the MB= R which was generated by the install script and they are both pretty OK and= legal. I reordered files on the MSDOS partition. I played with different = =E2=80=9EBIOS=E2=80=9C geometries (because Linux and FreeBSD have a rather = different sight on this) to produce the partitions. > > Nothing helps - it does not boot FreeBSD from the eMMC MSDOS Partition. T= he only thing which made a difference was, when i used the Linux-generated = MSDOS partition, removed the files in it and populated it with the FreeBSD-= generated MLO and things - then it booted from it. I failed completely to a= dd an UFS partition after the Linux-generated MSDOS partition, tried gpart,= fdisk, bsdlabel. The UFS mmcsd1s2a can be generated, populated, fsck=E2=80= =99d, tested, checked - after the next powercycle it simply disappeared. > > It seems to me that there is a bit more magic involved than only generate= the partitions. In the Linux script to generate the image onto the eMMC, t= hey check for: > > HEADER=3D$(hexdump -e '8/1 "%c"' /sys/bus/i2c/devices/0-0050/eeprom -s 5 = -n 3) > > and possibly write to an eeprom - has someone an idea why this is needed = ? > > Hellmuth > > Is your msdosfs slice on the eMMC aligned to 1 MB? I had the same "CCC" problem when I aligned the partition and used newfs_msdos. Removing the sector count adjustment calculation in newfs_msdos as was done in NetBSD worked for me. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D183234 Regards, Guy
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