I stop in U-boot, and I use the failumsboot command to put it into UMS mode. 
And it does present a UMS device, I just can't do anything with it.

U-Boot SPL 2015.10-rc3-00001-gfb375b5 (Sep 10 2015 - 10:07:48)
bad magic
U-Boot 2015.10-rc3-00001-gfb375b5 (Sep 10 2015 - 10:07:48 -0500), Build: 
jenkins-github_Bootloader-Builder-222

> On Sep 26, 2015, at 18:36 , William Hermans <[email protected]> wrote:
> 
> RCN's Console debian image will not work. Unless He has recently changed 
> g_ether from being compiled into the kernel. e.g. you can not have more than 
> one gadget driver loaded / used at one time.
> 
> Unless you find some way to remove a driver module that is compiled in 
> statically.
> 
> On Sat, Sep 26, 2015 at 6:26 PM, Rick Mann <[email protected]> wrote:
> 
> > On Sep 26, 2015, at 04:48 , Philip Polstra <[email protected]> wrote:
> >
> > What OS are you running on the BBB?  In most cases the BBB will export a 
> > Linux USB gadget which is a composite device with mass storage and Ethernet 
> > enabled by default.  Your Mac may need a driver.  Also passing USB devices 
> > through to VM is not automatic.
> 
> It's RCN's recent debian console jessie snapshot. The Mac should support UMS 
> out of the box, but we'll see. Meanwhile I fixed it by booting from the SD 
> card.
> 
> >
> >
> > On Sat, Sep 26, 2015, 5:17 AM Rick Mann <[email protected]> wrote:
> > I'm unable to get the USB Mass Storage thing to work on my Mac, or my 
> > Ubuntu 14.04 VM. It's the little port, right, the mini-USB connector? 
> > Anyway, when I interrupt U-Boot, I did this:
> >
> > > => setenv umsmedia 0; gpio set 53; run findfdt; setenv mmcdev 1; setenv 
> > > bootpart 1:1; run mmcboot
> > >
> > > FAILSAFE: U-Boot UMS (USB Mass Storage) enabled, media now available over 
> > > the usb slave port ...
> > > UMS: disk start sector: 0x0, count: 0x734000
> > > musb-hdrc: peripheral reset irq lost!
> >
> > When I connect my Mac to the small port, the Mac reports a USB download 
> > gadget, not a mass storage device. When I try to connect that to the Linux 
> > VM, I don't see anything (but don't know where to look).
> >
> > Alternatively, how do I change the dyndbg setting that U-Boot is loading?
> >
> > The problem:
> >
> > I updated my uEnv.txt to turn on more debugging output, and I think it 
> > hosed part of the boot process, which times out now (it just repeats the 
> > last bit over and over):
> >
> > > Loading, please wait...
> > > fsck from util-linux 2.25.2
> > > BEAGLEBONE: recovering journal
> > > BEAGLEBONE: clean, 43481/236176 files, 285892/943872 blocks
> > > [    9.931380] rtlwifi: Firmware rtlwifi/rtl8192cufw_TMSC.bin not 
> > > available
> > > [   10.860147] libphy: PHY 4a101000.mdio:01 not found
> > > [   10.864972] net eth0: phy 4a101000.mdio:01 not found on slave 1
> > >          Starting Journal Service...
> > > [ TIME ] Timed out waiting for device dev-ttyGS0.device.
> > > [   95.707797] systemd[1]: Timed out waiting for device dev-ttyGS0.device.
> > > [DEPEND] Dependency failed for Serial Getty on ttyGS0.
> > > [   95.727835] systemd[1]: Dependency failed for Serial Getty on ttyGS0.
> > >          Starting Journal Service...
> > > [  OK  ] Stopped Trigger Flushing of Journal to Persistent Storage.
> > >          Stopping Journal Service...
> > > [  OK  ] Stopped Journal Service.
> > >          Starting Journal Service...
> > > [  OK  ] Started Journal Service.
> > >          Starting Trigger Flushing of Journal to Persistent Storage...
> > > [  OK  ] Started Trigger Flushing of Journal to Persistent Storage.
> > > [ ***  ] A start job is running for LSB: Raise network interf...13s / no 
> > > limit)
> >
> > These variables don't seem to be loaded into the environment, and I don't 
> > see an obvious command for adjusting them:
> >
> > > Running uname_boot ...
> > > loading /boot/vmlinuz-4.1.4-ti-r9 ...
> > > 8259336 bytes read in 473 ms (16.7 MiB/s)
> > > loading /boot/dtbs/4.1.4-ti-r9/am335x-boneblack-emmc-overlay.dtb ...
> > > 55644 bytes read in 28 ms (1.9 MiB/s)
> > > loading /boot/initrd.img-4.1.4-ti-r9 ...
> > > 4496957 bytes read in 272 ms (15.8 MiB/s)
> > >
> > > debug: [console=ttyO0,115200n8 dyndbg=file drivers/of* +pflm; file 
> > > drivers/i2c* +pflm; file drivers/remoteproc +pflm; file sound* +pflm; 
> > > file pinctrl/* +pflm; file drivers/gpio/* +pflm; file drivers/regulator* 
> > > +pflm; file *cape* +pflm root=UUID=69f859b1-c308-41c9-8ca7-a3d0042031e8 
> > > ro rootfstype=ext4 rootwait fixrtc coherent_pool=1M quiet] ...
> > >
> > > debug: [bootz 0x82000000 0x88080000:449e3d 0x88000000] ...
> >
> >
> > Thanks…
> >
> > --
> > Rick Mann
> > [email protected]
> >
> >
> > --
> > For more options, visit http://beagleboard.org/discuss
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> 
> --
> Rick Mann
> [email protected]
> 
> 
> --
> For more options, visit http://beagleboard.org/discuss
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-- 
Rick Mann
[email protected]


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