Rpi boots with boot.scr and does not with extlinux.conf

[Laurentiu-Cristian Duca]

Hello,

I am new to u-boot and I am facing the following problem.

I use U-Boot 2021.04-rc3-00073-g6a026e5649
in a raspberry pi zero w board.

It boots linux when using boot.scr made by using the following boot.cmd
"
fdt addr ${fdt_addr} && fdt get value bootargs /chosen bootargs
fatload mmc 0:1 ${kernel_addr_r} uImage
bootm ${kernel_addr_r} - ${fdt_addr}
"
cmdline.txt is: root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200
See boot messages [1]

But if I delete boot.scr and use the following extlinux.conf
"
label rpi0w-buildroot
  kernel uImage
  devicetree bcm2708-rpi-0-w.dtb
  append root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200
"
the boot stops at "Starting kernel ...".
See boot messages [2].

Any ideas why it works with boot.scr and it does not with extlinux.conf?

Thank you,
L-C


[1]
scanning mmc 0:1...
Found U-Boot script /boot.scr
213 bytes read in 2 ms (103.5 KiB/s)
## Executing script at 02400000
4688408 bytes read in 201 ms (22.2 MiB/s)
## Booting kernel from Legacy Image at 00080000 ...
   Image Name:   Linux kernel
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    4688344 Bytes = 4.5 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 19bea100
   Booting using the fdt blob at 0x19bea100
   Loading Kernel Image
   Using Device Tree in place at 19bea100, end 19bf2f9b

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.14.95 (laur at laurPC100) (gcc version
7.4.0 (Buildroot 2019.02)) #3 Mon Dec 2 18:29:57 EET 2019
[    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 Zero W Rev 1.1
[    0.000000] Memory policy: Data cache writeback
[    0.000000] cma: Reserved 8 MiB at 0x19000000
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 104545
[    0.000000] Kernel command line: 8250.nr_uarts=1
bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1
smsc95xx.macaddr=B8:27:EB:AA:52:0F vc_mem.mem_ba0


[2]
Scanning mmc 0:1...
Found /boot/extlinux/extlinux.conf
Retrieving file: /boot/extlinux/extlinux.conf
146 bytes read in 4 ms (35.2 KiB/s)
1:      rpi0w-buildroot
Retrieving file: /boot/extlinux/uImage
4688408 bytes read in 202 ms (22.1 MiB/s)
append: root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200
Retrieving file: /boot/extlinux/bcm2708-rpi-0-w.dtb
23315 bytes read in 5 ms (4.4 MiB/s)
## Booting kernel from Legacy Image at 00080000 ...
   Image Name:   Linux kernel
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    4688344 Bytes = 4.5 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 02600000
   Booting using the fdt blob at 0x2600000
   Loading Kernel Image
   Using Device Tree in place at 02600000, end 02608b12

Starting kernel ...