PYNQ-Z2 boards won't boot

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1

I have two Pynq-Z2 boards. Neither will boot. One gives no message at all when booted and the other gives a normal boot log until it suddenly resets:

U-Boot 2022.01 (Apr 04 2022 - 07:53:54 +0000)

CPU: Zynq 7z020
Silicon: v3.1
DRAM: ECC disabled 512 MiB
Flash: 0 Bytes
NAND: 0 MiB
MMC: mmc@e0100000: 0
Loading Environment from FAT… *** Error - No Valid Environment Area found
*** Warning - bad env area, using default environment

In: serial@e0000000
Out: serial@e0000000
Err: serial@e0000000
Net:
ZYNQ GEM: e000b000, mdio bus e000b000, phyaddr -1, interface rgmii-id
SF: Detected s25fl128s with page size 256 Bytes, erase size 64 KiB, total 16 MiB
eth0: ethernet@e000b000
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1…
Found U-Boot script /boot.scr
2776 bytes read in 10 ms (270.5 KiB/s)

Executing script at 03000000

Trying to load boot images from mmc0
6464328 bytes read in 366 ms (16.8 MiB/s)

Loading kernel from FIT Image at 10000000 …

Using ‘conf-1’ configuration
Verifying Hash Integrity … OK
Trying ‘kernel-0’ kernel subimage
Description: Linux Kernel
Type: Kernel Image
Compression: uncompressed
Data Start: 0x100000d4
Data Size: 6442720 Bytes = 6.1 MiB
Architecture: ARM
OS: Linux
Load Address: 0x00080000
Entry Point: 0x00080000
Hash algo: sha1
Hash value: b056acb229d05b806f975396dacae4ad04002e0c
Verifying Hash Integrity … sha1+ OK

Loading fdt from FIT Image at 10000000 …

Using ‘conf-1’ configuration
Verifying Hash Integrity … OK
Trying ‘fdt-0’ fdt subimage
Description: Flattened Device Tree blob
Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x106250a8
Data Size: 19792 Bytes = 19.3 KiB
Architecture: ARM
Hash algo: sha1
Hash value: c20e513daf724f7b1b134fa9af089b026612751e
Verifying Hash Integrity … sha1+ OK
Booting using the fdt blob at 0x106250a8
Loading Kernel Image
Loading Device Tree to 1ead4000, end 1eadbd4f … OK

Starting kernel …

Booting Linux on physical CPU 0x0
Linux version 5.15.19-xilinx-v2022.1 (oe-user@oe-host) (arm-xilinx-linux-gnueabi-gcc (GCC) 11.2.0, GNU ld (GNU Binutils) 2.37.20210721) #1 SMP PREEMPT Mon Apr 11 17:52:14 UTC 2022
CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=18c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
OF: fdt: Machine model: xlnx,zynq-7000
Memory policy: Data cache writealloc
cma: Reserved 128 MiB at 0x16800000
Zone ranges:
Normal [mem 0x0000000000000000-0x000000001fffffff]
HighMem empty
Movable zone start for each node
Early memory node ranges
node 0: [mem 0x0000000000000000-0x000000001fffffff]
Initmem setup node 0 [mem 0x0000000000000000-0x000000001fffffff]
percpu: Embedded 12 pages/cpu s18828 r8192 d22132 u49152
Built 1 zonelists, mobility grouping on. Total pages: 129920
Kernel command line: root=/dev/mmcblk0p2 rw earlyprintk rootfstype=ext4 rootwait devtmpfs.mount=1 uio_pdrv_genirq.of_id=“generic-uio” clk_ignore_unused
Unknown kernel command line parameters “earlyprintk”, will be passed to user space.
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
mem auto-init: stack:off, heap alloc:off, heap free:off
Memory: 373332K/524288K available (9216K kernel code, 324K rwdata, 2512K rodata, 1024K init, 296K bss, 19884K reserved, 131072K cma-reserved, 0K highmem)
rcu: Preemptible hierarchical RCU implementation.
rcu: RCU event tracing is enabled.
rcu: RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
Trampoline variant of Tasks RCU enabled.
Tracing variant of Tasks RCU enabled.
rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
efuse mapped to (ptrval)
slcr mapped to (ptrval)
GIC physical location is 0xf8f01000
L2C: platform modifies aux control register: 0x72360000 → 0x72760000
L2C: DT/platform modifies aux control register: 0x72360000 → 0x72760000
L2C-310 erratum 769419 enabled
L2C-310 enabling early BRESP for Cortex-A9
L2C-310 full line of zeros enabled for Cortex-A9
L2C-310 ID prefetch enabled, offset 1 lines
L2C-310 dynamic clock gating enabled, standby mode enabled
L2C-310 cache controller enabled, 8 ways, 512 kB
L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x76760001
random: get_random_bytes called from start_kernel+0x364/0x5f8 with crng_init=0
zynq_clock_init: clkc starts at (ptrval)
Zynq clock init
sched_clock: 64 bits at 162MHz, resolution 6ns, wraps every 4398046511101ns
clocksource: arm_global_timer: mask: 0xffffffffffffffff max_cycles: 0x257a3bfb55, max_idle_ns: 440795207830 ns
Switching to timer-based delay loop, resolution 6ns
Console: colour dummy device 80x30
printk: console [tty0] enabled
Calibrating delay loop (skipped), value calculated using timer frequency… 325.00 BogoMIPS (lpj=1625000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
CPU: Testing write buffer coherency: ok
CPU0: Spectre v2: using BPIALL workaround
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
Setting up static identity map for 0x100000 - 0x100060
rcu: Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs …
CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
CPU1: Spectre v2: using BPIALL workaround
smp: Brought up 1 node, 2 CPUs
SMP: Total of 2 processors activated (650.00 BogoMIPS).
CPU: All CPU(s) started in SVC mode.
devtmpfs: initialized
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
futex hash table entries: 512 (order: 3, 32768 bytes, linear)
pinctrl core: initialized pinctrl subsystem
NET: Registered PF_NETLINK/PF_ROUTE protocol family
DMA: preallocated 256 KiB pool for atomic coherent allocations
thermal_sys: Registered thermal governor ‘step_wise’
cpuidle: using governor menu
amba f8801000.etb: Fixing up cyclic dependency with replicator
amba f8803000.tpiu: Fixing up cyclic dependency with replicator
amba f8804000.funnel: Fixing up cyclic dependency with replicator
amba f889c000.ptm: Fixing up cyclic dependency with f8804000.funnel
amba f889d000.ptm: Fixing up cyclic dependency with f8804000.funnel
hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
hw-breakpoint: maximum watchpoint size is 4 bytes.
zynq-ocm f800c000.ocmc: ZYNQ OCM pool: 256 KiB @ 0x(ptrval)
e0000000.serial: ttyPS0 at MMIO 0xe0000000 (irq = 34, base_baud = 6250000) is a xuartps
printk: console [ttyPS0] enabled
raid6: int32x8 gen() 117 MB/s
raid6: int32x8 xor() 78 MB/s
raid6: int32x4 gen() 125 MB/s
raid6: int32x4 xor() 87 MB/s
raid6: int32x2 gen() 200 MB/s
raid6: int32x2 xor() 125 MB/s
raid6: int32x1 gen() 180 MB/s
raid6: int32x1 xor() 100 MB/s
raid6: using algorithm int32x2 gen() 200 MB/s
raid6: … xor() 125 MB/s, rmw enabled
raid6: using intx1 recovery algorithm
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
mc: Linux media interface: v0.10
videodev: Linux video capture interface: v2.00
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti giometti@linux.it
PTP clock support registered
EDAC MC: Ver: 3.0.0
FPGA manager framework
Advanced Linux Sound Architecture Driver Initialized.
clocksource: Switched to clocksource arm_global_timer
NET: Registered PF_INET protocol family
IP idents hash table entries: 8192 (order: 4, 65536 bytes, linear)
tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
TCP established hash table entries: 4096 (order: 2, 16384 bytes, linear)
TCP bind hash table entries: 4096 (order: 3, 32768 bytes, linear)
TCP: Hash tables configured (established 4096 bind 4096)
UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
NET: Registered PF_UNIX/PF_LOCAL protocol family
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
PCI: CLS 0 bytes, default 64
armv7-pmu f8891000.pmu: hw perfevents: no interrupt-affinity property, guessing.
hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available
Initialise system trusted keyrings
workingset: timestamp_bits=14 max_order=17 bucket_order=3
squashfs: version 4.0 (2009/01/31) Phillip Lougher
jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
xor: measuring software checksum speed
arm4regs : 1045 MB/sec
8regs : 805 MB/sec
32regs : 836 MB/sec
xor: using function: arm4regs (1045 MB/sec)
Key type asymmetric registered
Asymmetric key parser ‘x509’ registered
io scheduler mq-deadline registered
io scheduler kyber registered
zynq-pinctrl 700.pinctrl: zynq pinctrl initialized
dma-pl330 f8003000.dmac: Loaded driver for PL330 DMAC-241330
dma-pl330 f8003000.dmac: DBUFF-128x8bytes Num_Chans-8 Num_Peri-4 Num_Events-16
brd: module loaded
loop: module loaded
spi_master spi0: cannot find modalias for /axi/spi@e000d000/flash@0
spi_master spi0: Failed to create SPI device for /axi/spi@e000d000/flash@0
tun: Universal TUN/TAP device driver, 1.6
CAN device driver interface
macb e000b000.ethernet eth0: Cadence GEM rev 0x00020118 at 0xe000b000 irq 36 (00:00:05:6b:03:a8)
e1000e: Intel(R) PRO/1000 Network Driver
e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
ehci_hcd: USB 2.0 ‘Enhanced’ Host Controller (EHCI) Driver
ehci-pci: EHCI PCI platform driver
usbcore: registered new interface driver cdc_acm
cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
usbcore: registered new interface driver cdc_wdm
usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbcore: registered new interface driver usb_serial_simple
usbserial: USB Serial support registered for carelink
usbserial: USB Serial support registered for zio
usbserial: USB Serial support registered for funsoft
usbserial: USB Serial support registered for flashloader
usbserial: USB Serial support registered for google
usbserial: USB Serial support registered for libtransistor
usbserial: USB Serial support registered for vivopay
usbserial: USB Serial support registered for moto_modem
usbserial: USB Serial support registered for motorola_tetra
usbserial: USB Serial support registered for novatel_gps
usbserial: USB Serial support registered for hp4x
usbserial: USB Serial support registered for suunto
usbserial: USB Serial support registered for siemens_mpi
ULPI transceiver vendor/product ID 0x0451/0x1507
Found TI TUSB1210 ULPI transceiver.
ULPI integrity check: passed.
ci_hdrc ci_hdrc.0: EHCI Host Controller
ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected

Then, rather than the next line (“i2c_dev: i2c /dev entries driver” on a good device), the boot process starts over again.

I’ve tried swapping the SD cards between a good device and the bad devices and all three SD cards work on the good device and not on the bad devices.

I suspect this is a hardware issue, but I wanted to see if anyone has any other debugging ideas.

2

I’m not sure about the board that is not booting at all. It does sound like a hardware issue. Do you see any LEDS?
You could try to conenct to Vivado and see if you can connect to the board at all.

Mainly for the second board where the boot fails;
Does it consistently fail at exactly the same point? The partial boot process indicates the board is mostly functional.
Are you powering the board from a USB port on your PC or laptop? Some USB ports can’t provide sufficient power (especially laptop ports in a low power mode)
Try connect the it to a USB plug. This will prevent you from seeing the UART output but it should indicate if the board boots.
Do you have more boards that are working properly?

Cathal

3

The CR8 led lights up (in both cases).

The second board consistently fails at the same place.

I have several boards that are working properly, with the same SD card and plugged into the same USB port.

4

I’ve recently encountered two boards that can’t seem to boot from the SD card either. The SD cards work in other boards that boot fine, but these two boards don’t even show anything when connecting to them via UART. Any tips on how to further diagnose the board?

5

I’d suggest you try to contact the vendor.

Cathal