Tag: linux

boot order – Raspbery pi

  • Edit boot order(read from right to left)
rpi-eeprom-config -e
ValueModeDescription
0x0SD CARD DETECTTry SD then wait for card-detect to indicate that the card has changed – deprecated now that 0xf (RESTART) is available.
0x1SD CARDSD card (or eMMC on Compute Module 4).
0x2NETWORKNetwork boot – See Network boot server tutorial
0x3RPIBOOTRPIBOOT – See usbboot
0x4USB-MSDUSB mass storage boot – See USB mass storage boot
0x5BCM-USB-MSDUSB 2.0 boot from USB Type C socket (CM4: USB type A socket on CM4IO board). Not available on Raspberry Pi 5.
0x6NVMECM4 and Pi 5 only: boot from an NVMe SSD connected to the PCIe interface. See NVMe boot for more details.
0x7HTTPHTTP boot over ethernet. See HTTP boot for more details.
0xeSTOPStop and display error pattern. A power cycle is required to exit this state.
0xfRESTARTRestart from the first boot-mode in the BOOT_ORDER field i.e. loop

boot order: https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#BOOT_ORDER

Skopeo – Copy multi arch image from one registry to another registry

login to the repository:

[home@home ~]$ skopeo login --username $USER docker.io
Password: 
Login Succeeded!

Copy:

skopeo copy -a docker://nginx docker://$USER/nginx

References:

rysnc –partial , -P is awesome


[home@home Downloads]$ time rsync -parvP ubuntu-20.04.4-live-server-amd64.iso [email protected]:/tmp
sending incremental file list
ubuntu-20.04.4-live-server-amd64.iso
    646,053,888  48%   11.15MB/s    0:01:00  ^C
rsync error: unexplained error (code 255) at rsync.c(703) [sender=3.2.3]

real	0m56.958s
user	0m6.159s
sys	0m2.564s





[home@home Downloads]$ time rsync -parvP ubuntu-20.04.4-live-server-amd64.iso [email protected]:/tmp
sending incremental file list
ubuntu-20.04.4-live-server-amd64.iso
  1,331,691,520 100%   20.02MB/s    0:01:03 (xfr#1, to-chk=0/1)

sent 658,982,006 bytes  received 178,830 bytes  9,765,345.72 bytes/sec
total size is 1,331,691,520  speedup is 2.02

real	1m6.846s
user	0m27.066s
sys	0m1.862s
[home@home Downloads]$ time rsync -parv ubuntu-20.04.4-live-server-amd64.iso [email protected]:/tmp
sending incremental file list
ubuntu-20.04.4-live-server-amd64.iso

sent 1,332,016,766 bytes  received 35 bytes  11,633,334.51 bytes/sec
total size is 1,331,691,520  speedup is 1.00

real	1m54.871s
user	0m6.400s
sys	0m3.748s

optimize your binary file size with strip command

Strip command strips the symbols form object file.

strip /path/to/binaryfile

strip -s /path/to/binaryfile

# on strip debug symbols

strip --strip-debug example

To view all symbols in binary(readelf)

readelf -s /path/to/binaryfile

nm command:

nm /path/to/binaryfile

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