Raspberry Pi Boot 1b / Uboot boot failure with large initramfs

Frederik Lotter frederik.lotter at gmail.com
Mon Dec 6 07:54:57 CET 2021


I am facing intermittend boot failures resulting in a data abort. Boot log
and environment attached below. The uboot is built with rpi_defconfig with
OF_BOARD to get uboot to pass through the FDT.


(1) If I boot this image directly using the RPI bootloader, the kernel
(with initramfs embedded) boots fine consistently.

(2) However, I get inconsistent failures with uboot. My gut tells me
memory is getting corrupted.

(3) Sometimes just adding one option to the bootargs breaks the next boot.

(4) It seems the FDT address changes slightly (see failed vs OK). Not sure
if this is expected from start.elf (I assume the FDT address is supplied to

(5) Is the size of the image overwriting anything in u-boot? I am not that
familiar with the u-boot memory map.

I boot using the following environment changes:
bootargs=bootslot=a console=ttyAMA0,115200 root=/dev/null
bootcmd=fatload mmc 0:1 ${kernel_addr_r}  kernel.a.img ;  bootz
${kernel_addr_r} - ${fdtcontroladdr}

Any ideas?



DRAM:  448 MiB
RPI Model B rev2 (0xe)
MMC:   mmc at 7e202000: 0
Loading Environment from FAT... OK
In:    serial
Out:   vidconsole
Err:   vidconsole
Net:   No ethernet found.
starting USB...
Bus usb at 7e980000: usb dr_mode not found
scanning bus usb at 7e980000 for devices... 3 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot:  0
70746744 bytes read in 2940 ms (22.9 MiB/s)
Kernel image @ 0x080000 [ 0x000000 - 0x4378278 ]
## Flattened Device Tree blob at 1bb500e0
   Booting using the fdt blob at 0x1bb500e0
   Using Device Tree in place at 1bb500e0, end 1bb59ebe
data abort
pc : [<1bf5c4ec>]          lr : [<1bf5c7c4>]
reloc pc : [<000094ec>]    lr : [<000097c4>]
sp : 1bb4fdb8  ip : 0000000c     fp : 00000003
r10: 00000000  r9 : 1bb56ec0     r8 : 1bb6bad4
r7 : 00000000  r6 : 00080000     r5 : 1bfc5874  r4 : 00000400
r3 : 0074616d  r2 : 1bb6bad4     r1 : 00000400  r0 : 1bfc5874
Flags: nzcv  IRQs off  FIQs off  Mode SVC_32
Code: e12fff1e e92d4073 e5993000 e5906060 (e5933038)
Resetting CPU ...

resetting ...


board_name=Model B rev2
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr}
${prefix}${script}; source ${scriptaddr}
boot_efi_binary=load ${devtype} ${devnum}:${distro_bootpart}
${kernel_addr_r} efi/boot/bootarm.efi; if fdt addr ${fdt_addr_r}; then
bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r}
boot_efi_bootmgr=if fdt addr ${fdt_addr_r}; then bootefi bootmgr
${fdt_addr_r};else bootefi bootmgr;fi
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any
${scriptaddr} ${prefix}${boot_syslinux_conf}
boot_net_usb_start=usb start
boot_prefixes=/ /boot/
boot_scripts=boot.scr.uimg boot.scr
boot_targets=mmc0 mmc1 usb0 pxe dhcp
bootargs=bootslot=a console=ttyAMA0,115200 root=/dev/null
bootcmd=fatload mmc 0:1 ${kernel_addr_r}  kernel.a.img ;  bootz
${kernel_addr_r} - ${fdtcontroladdr}
bootcmd_dhcp=devtype=dhcp; run boot_net_usb_start; if dhcp ${scriptaddr}
${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile
${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile
${soc}-${board}${boardver}.dtb; fi; setenv efi_old_vci ${bootp_vci};setenv
efi_old_arch ${bootp_arch};setenv bootp_vci
PXEClient:Arch:00010:UNDI:003000;setenv bootp_arch 0xa;if dhcp
${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt
addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else
bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci
${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv
efi_old_arch;setenv efi_old_vci;
bootcmd_mmc0=devnum=0; run mmc_boot
bootcmd_mmc1=devnum=1; run mmc_boot
bootcmd_pxe=run boot_net_usb_start; dhcp; if pxe get; then pxe boot; fi
bootcmd_usb0=devnum=0; run usb_boot
dhcpuboot=usb start; dhcp u-boot.uimg; bootm
distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done
efi_dtb_prefixes=/ /dtb/ /dtb/current/
load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r}
mmc_boot=if mmc dev ${devnum}; then devtype=mmc; run
scan_dev_for_boot_part; fi
preboot=usb start
scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...;
for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run
scan_dev_for_scripts; done;run scan_dev_for_efi;
scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist;
env exists devplist || setenv devplist 1; for distro_bootpart in
${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart}
bootfstype; then run scan_dev_for_boot; fi; done; setenv devplist
scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a
-n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi;
for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype}
${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run
load_efi_dtb; fi;done;run boot_efi_bootmgr;if test -e ${devtype}
${devnum}:${distro_bootpart} efi/boot/bootarm.efi; then echo Found EFI
removable media binary efi/boot/bootarm.efi; run boot_efi_binary; echo EFI
LOAD FAILED: continuing...; fi; setenv efi_fdtfile
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart}
${prefix}${boot_syslinux_conf}; then echo Found
${prefix}${boot_syslinux_conf}; run boot_extlinux; echo SCRIPT FAILED:
continuing...; fi
scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e
${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found
U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED:
continuing...; fi; done
usb_boot=usb start; if usb dev ${devnum}; then devtype=usb; run
scan_dev_for_boot_part; fi


U-Boot> boot
70746744 bytes read in 2942 ms (22.9 MiB/s)
Kernel image @ 0x080000 [ 0x000000 - 0x4378278 ]
## Flattened Device Tree blob at 1bb500c0
   Booting using the fdt blob at 0x1bb500c0
   Using Device Tree in place at 1bb500c0, end 1bb59eaa

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.10.82-rpiv6-kernos (root at flotter-pc)
(armv6-rpi-linux-musleabihf-gcc (crosstool-NG UNKNOWN) 11.2.0, GNU ld
(crosstool-NG UNKNOWN) 2.37) #2 Mon Dec 6 00:09:19 SAST 2021
[    0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7
(ARMv7), cr=00c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT nonaliasing
instruction cache
[    0.000000] OF: fdt: Machine model: Raspberry Pi Model B Rev 2
[    0.000000] random: fast init done
[    0.000000] Memory policy: Data cache writeback
[    0.000000] Reserved memory: created CMA memory pool at 0x17800000, size
64 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible id
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x000000001bffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000001bffffff]
[    0.000000] Initmem setup node 0 [mem
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 113680
[    0.000000] Kernel command line: bootslot=a console=ttyAMA0,115200
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144
bytes, linear)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072
bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 310640K/458752K available (8867K kernel code, 1325K
rwdata, 2792K rodata, 64024K init, 836K bss, 82576K reserved, 65536K
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] ftrace: allocating 29813 entries in 88 pages
[    0.000000] ftrace: allocated 88 pages with 3 groups
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] random: get_random_bytes called from
start_kernel+0x32c/0x57c with crng_init=1
[    0.000027] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps
every 2147483647500ns
[    0.000104] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff,
max_idle_ns: 1911260446275 ns
[    0.000199] bcm2835: system timer (irq = 27)
[    0.000890] Console: colour dummy device 80x30
[    0.000997] Calibrating delay loop... 697.95 BogoMIPS (lpj=3489792)
[    0.060356] pid_max: default: 32768 minimum: 301
[    0.060665] LSM: Security Framework initializing
[    0.061003] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes,
[    0.061050] Mountpoint-cache hash table entries: 1024 (order: 0, 4096
bytes, linear)
[    0.063391] cgroup: Disabling memory control group subsystem
[    0.063847] CPU: Testing write buffer coherency: ok
[    0.066086] Setting up static identity map for 0x8240 - 0x8278
[    0.067555] devtmpfs: initialized
[    0.079529] VFP support v0.3: implementor 41 architecture 1 part 20
variant b rev 5
[    0.079971] clocksource: jiffies: mask: 0xffffffff max_cycles:
0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.080032] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[    0.089374] pinctrl core: initialized pinctrl subsystem
[    0.091692] NET: Registered protocol family 16
[    0.095545] DMA: preallocated 256 KiB pool for atomic coherent
[    0.102090] audit: initializing netlink subsys (disabled)
[    0.103799] thermal_sys: Registered thermal governor 'step_wise'
[    0.104272] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.
[    0.104322] hw-breakpoint: maximum watchpoint size is 4 bytes.
[    0.104631] Serial: AMBA PL011 UART driver
[    0.110828] audit: type=2000 audit(0.100:1): state=initialized
audit_enabled=0 res=1
[    0.127927] bcm2835-mbox 2000b880.mailbox: mailbox enabled
[    0.140861] raspberrypi-firmware soc:firmware: Attached to firmware from
2021-12-01T11:48:03, variant start
[    0.150873] raspberrypi-firmware soc:firmware: Firmware hash is
[    0.204413] Kprobes globally optimized
[    0.215320] bcm2835-dma 20007000.dma: DMA legacy API manager,
[    0.218694] SCSI subsystem initialized
[    0.219212] usbcore: registered new interface driver usbfs
[    0.219352] usbcore: registered new interface driver hub
[    0.219487] usbcore: registered new device driver usb
[    0.222073] clocksource: Switched to clocksource timer

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