On Wed, Mar 7, 2018 at 8:36 AM, evilwulfie <evilwul...@gmail.com> wrote:
> I got a shipment of beaglebone blacks in this week. They will boot on
> the provided kernel 4.1
> i have not tested anything more with that kernel.
>
> I have a SD card with some custom tests for specific hardware that runs
> with a beaglebone black
> it runs the 4.14 kernel and works fine on an older beaglebone black
> all tests run everything works as expected on my custom hardware.
>
> here is a pastebin of the dmesg    https://pastebin.com/uY4M3FmW
>
> Now this same working SD card when plugged into the new beaglebones
> dmesg    https://pastebin.com/z0k42qMA
>
> First off I2C-1 fails to work, The SD card loads the overlay from
> uEnv.txt but no workie
> second i have one I/O pin that fails to work    GPIO3_21 ahclkx P9-25 A14
> This fails when not plugged into anything except power and ethernet
>
> This all works flawlessly on my other beaglebone black
>
> I have a few of these new beaglebones that fail the same way.    I have
> not tested them all
>
> from the dmesg a few things stand out
>
> old beaglebone:     [    0.000000] Kernel command line:
> console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1
> root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M
> net.ifnames=0 quiet
>
> new beaglebone:   [    0.000000] Kernel command line:
> console=ttyO0,115200n8 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait
> coherent_pool=1M net.ifnames=0 quiet
>
> Why would capemgr load on boot on old bone but not new bone ?
>
> remember this is the same SD card booting on different bones,  Why are
> these lines different.
>
> Again
>
> old beaglebone:       [    0.470487] omap_i2c 44e0b000.i2c: could not
> find pctldev for node
> /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring
> probe
>                                     [    0.470541] omap_i2c
> 4802a000.i2c: could not find pctldev for node
> /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_bb_i2c1_pins,
> deferring probe
>                                     [    0.471941] omap_i2c
> 4819c000.i2c: bus 2 rev0.11 at 100 kHz
>
> new beaglebone:     [    0.486500] omap_i2c 44e0b000.i2c: could not find
> pctldev for node
> /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring
> probe
>                                     [    0.487908] omap_i2c
> 4819c000.i2c: bus 2 rev0.11 at 100 kHz
>
> Its like I2C-1 is not there, maybe a pinmux change in hardware/firmware ?
>
> I will stop there as you can see the other changes in the pastebins
>
>
> Now the only thing i can think of is that the processors guts have changed
> old processor       AM3358BZCZ100    45C9DSW G1    962B ZCZ
> new processor     AM3358BZCZ100    6BC5EYW G1    962B ZCZ
>
> Reading the processor errata seems there are lots of changes but nothing
> that stands out to me
> http://www.ti.com/lit/pdf/sprz360
>
> Maybe one of you other list mates can shed some insight to this vexing issue
>

Let's find out:

sudo /opt/scripts/tools/version.sh

Regards,

-- 
Robert Nelson
https://rcn-ee.com/

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