Junos OS

Hii All,

after trying to update Juniper Ex3400 to latest jtac firmware, switch stuck in a boot loop.

Anyone have any ideas how to get to the loader ant boot it from usb?

Console output:

U-Boot 2016.01-rc1 (May 23 2016 - 08:45:58 -0700) VERSION=1.2.0

DRAM:  AVS: 0x0
DEV ID = 0xdc14
SKU ID = 0xb547
DDR type: DDR3
MEMC 0 DDR speed = 750MHz
PHY revision version: 0x00044006
SF: Detected MX25L6405D with page size 256 Bytes, erase size 64 KiB, total 8 MiB
In:    serial
Out:   serial
Err:   serial
FLASH bank: 1
Board: EX3400-48T
Base MAC: 28A24B80CC62
Net:   bcmiproc_eth-0
Last Reset Reason: 8
Hit ^C to stop autoboot:  0
SF: Detected MX25L6405D with page size 256 Bytes, erase size 64 KiB, total 8 MiB
device 0 offset 0x3c0000, size 0x10000
SF: 65536 bytes @ 0x3c0000 Read: OK

## Checking Image at 61000000 ...
   Legacy image found
   Image Name:   Juniper U-Boot Script File
   Image Type:   ARM Unknown OS Script (uncompressed)
   Data Size:    1803 Bytes = 1.8 KiB
   Load Address: 00000000
   Entry Point:  00000000
   Contents:
      Image 0: 1795 Bytes = 1.8 KiB
   Verifying Checksum ... OK
## Executing script at 61000000
Setting bus to 0
SF: Detected MX25L6405D with page size 256 Bytes, erase size 64 KiB, total 8 MiB, mapped at 00000a30
device 0 offset 0x140000, size 0x140000
SF: 1310720 bytes @ 0x140000 Read: OK
6113fffc: f1c1fb43                               C...
crc32 for 61000000 ... 6113ffff ==> 43fbc1f1
Total of 1 word(s) were the same
starting USB...
USB0:   phy ctrl 01d36440
Initial usb2h clock is: 000003fc
Initial usb2h clock is: 000003fd
iClk = 00000078, USBClk = 01536440

Bring usb2h_out of reset.......
usb2_reset_state is set and now it is: 00000000
usb2_reset_state is: 00000000
USB EHCI 1.00
scanning bus 0 for devices... 3 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
SF: Detected MX25L6405D with page size 256 Bytes, erase size 64 KiB, total 8 MiB, mapped at 00000088
## Starting application at 0x00000074 ...
Consoles: U-Boot console  

FreeBSD/armv6 U-Boot loader, Revision 1.2
(fbsd-builder@svl-bsdx-05.juniper.net, Wed May 18 12:32:06 PDT 2016)

DRAM: 2048MB
Number of U-Boot devices: 2
U-Boot env: loaderdev not set, will probe all devices.
Found U-Boot device: disk
  Probing all disk devices...
  Checking unit=0 slice=<auto> partition=<auto>... good.
/
Resetting...
resetting ...


U-Boot 2016.01-rc1 (May 23 2016 - 08:45:58 -0700) VERSION=1.2.0

DRAM:  AVS: 0x0
DEV ID = 0xdc14
SKU ID = 0xb547
DDR type: DDR3
MEMC 0 DDR speed = 750MHz
PHY revision version: 0x00044006
SF: Detected MX25L6405D with page size 256 Bytes, erase size 64 KiB, total 8 MiB

From the output it looks like you are not getting the options to stop at the boot loader which should be present.

https://kb.juniper.net/InfoCenter/index?page=content&id=KB31462

If you do have another switch, you can create a bootable USB using the snapshot to USB command.  When this is inserted into this switch and then powered up it should boot from USB before the internal media so you can regain control of the switch and reformat the internal media install from there.

Same problem with EX2300-C.

It was not a bright decision to put bootloader vars into a bootloader script file.

To change currdev var you have to get to loader> prompt, and even inserting valid USB stick doesn't help.

To get to loader prompt,

setenv loaderdev usb1:0
boot

From loader prompt tftp --format is failing with 

cannot open package (error 60)

boot -s also failing (Enter full pathname of shell or RETURN for /bin/sh: ), supposedly something wrong with chroot.

UPDATE: All 15.1X53-D59 images(tftp, USB install package+media) failed just as 15.1X53-D50, but 15.1X53-D58 USB install succeeded, however after install again a loaderdev override to usb0:0 was required.

@Juniper please bring back normal QA/release testing.