I downloaded the stretch-console for x15 and imaged an 8GB SD Card on macOS 
using Etcher. I put this in the x15 and powered it on. It gets partway through 
the boot process, and appears to be booting from the SD card (the installed 
kernel on the MMC is -r44, and the log shows -r96), but then it gets stuck. 
There's a fairly long delay after "mmc0: error -110 whilst initialising SD 
card." Console log below:

        https://pastebin.com/Y5pX3uBW


�
U-Boot SPL 2017.01-00360-gc604741cb3 (Aug 11 2017 - 15:47:09)
DRA752-GP ES2.0
Trying to boot from MMC1

** Unable to use mmc 0:1 for loading the env **
Using default environment



U-Boot 2017.01-00360-gc604741cb3 (Aug 11 2017 - 15:47:09 -0500), Build: 
jenkins-github_Bootloader-Builder-592

CPU  : DRA752-GP ES2.0
Model: TI AM5728 BeagleBoard-X15
Board: BeagleBoard X15 REV C.00
DRAM:  2 GiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1

** Unable to use mmc 0:1 for loading the env **
Using default environment

setup_board_eeprom_env: beagle_x15_revc
SCSI:  SATA link 0 timeout.
AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: 64bit ncq stag pm led clo only pmp pio slum part ccc apst 
scanning bus for devices...
Found 0 device(s).
Net:   <ethaddr> not set. Validating first E-fuse MAC
cpsw
Press SPACE to abort autoboot in 2 seconds
usb_boot is currently disabled
scsi_boot is currently disabled
switch to partitions #0, OK
mmc0 is current device
Scanning mmc device 0
Checking for: /uEnv.txt ...
Checking for: /boot/uEnv.txt ...
445 bytes read in 29 ms (14.6 KiB/s)
Loaded environment from /boot/uEnv.txt
Checking if uname_r is set in /boot/uEnv.txt ...
debug: [uname_r=4.9.79-ti-r96] ...
loading /boot/vmlinuz-4.9.79-ti-r96 ...
9961120 bytes read in 461 ms (20.6 MiB/s)
loading /boot/dtbs/4.9.79-ti-r96/am57xx-beagle-x15-revc.dtb ...
153258 bytes read in 84 ms (1.7 MiB/s)
loading /boot/initrd.img-4.9.79-ti-r96 ...
5756938 bytes read in 281 ms (19.5 MiB/s)
debug: [console=ttyO2,115200n8 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait 
coherent_pool=1M net.ifnames=0 quiet] ...
debug: [bootz 0x82000000 0x88080000:57d80a 0x88000000] ...
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Ramdisk to 8fa82000, end 8ffff80a ... OK
   Loading Device Tree to 8fa59000, end 8fa816a9 ... OK

Starting kernel ...

[    0.074308] /cpus/cpu@0 missing clock-frequency property
[    0.074332] /cpus/cpu@1 missing clock-frequency property
[    2.410682] dra7-pcie 51000000.pcie: phy link never came up
[    2.671093] omap_hsmmc 480b4000.mmc: no pinctrl state for sdr25 mode
[    2.686786] omap_hsmmc 480b4000.mmc: no pinctrl state for sdr12 mode
[    2.759464] omap_voltage_late_init: Voltage driver support not added
[    3.760897] omap_hsmmc 4809c000.mmc: card busy
[    3.810275] mmc0: error -110 whilst initialising SD card
Gave up waiting for root file system device.  Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (did the system wait long enough?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT!  /dev/mmcblk0p1 does not exist.  Dropping to a shell!
(initramfs) 


-- 
Rick Mann
rm...@latencyzero.com


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