구차니의 잡동사니 모음

 The problem with YAFFS, T'so explained in his blog entry, is that it is single-threaded and would likely "have been a bottleneck on dual-core systems." Concurrency will be important on next-generation Android devices that use multi-core ARM processors.

Because your old disc was partitioned with a old utility, such as the Linux fdisk, that uselessly implemented track-alignment using the entirely fake disc geometry that you see reported, and your new disc has been or is being partitioned by a newer utility that (by default) aligns to 1MiB boundaries instead. 

In other words, the LBA sector number 63 corresponds to cylinder 0, head 1, sector 1 in the CHS format, which is the first sector you can use in the MBR format. However, the number 63 is not divisible by 8, which causes a problem with 4K drives, so some modern tools starts the first partition at 2048 which also provides future GPT compatibility. – billc.cn Oct 31 '11 at 23:48 

$ hostname -i

127.0.0.1

$ hostname -I

192.168.10.11 

-i, --ip-address

Display the IP address(es) of the host. Note that this works only if the host name can be resolved. Avoid using this option; use hostname --all-ip-addresses instead. 

-I, --all-ip-addresses

Display all network addresses of the host. This option enumerates all configured addresses on all network interfaces. The loopback interface and IPv6 link-local addresses are omitted. Contrary to option -i, this option does not depend on name resolution. Do not make any assumptions about the order of the output.

$ sudo vi /etc/X11/xorg.conf

Section "ServerFlags"

    Option "DontVTSwitch" "true"

EndSection 

$ sudo sysctl disable serial-getty@ttySAC1.service

sysctl: cannot stat /proc/sys/disable: No such file or directory

sysctl: cannot stat /proc/sys/serial-getty@ttySAC1/service: No such file or directory

$ ll /proc/sys

total 0

dr-xr-xr-x   1 root root 0 ene  1  2000 ./

dr-xr-xr-x 150 root root 0 ene  1  1970 ../

dr-xr-xr-x   1 root root 0 oct 12 00:57 debug/

dr-xr-xr-x   1 root root 0 oct 12 00:57 dev/

dr-xr-xr-x   1 root root 0 ene  1  2000 fs/

dr-xr-xr-x   1 root root 0 ene  1  2000 kernel/

dr-xr-xr-x   1 root root 0 ene  1  2000 net/

dr-xr-xr-x   1 root root 0 ene  1  2000 vm/ 

$ sudo vi /etc/sysctl.conf

kernel.printk = 0 4 1 7 

# sysctl -w kernel.printk="2 4 1 7"

kernel.printk = 2 4 1 7

# sysctl kernel.printk

kernel.printk = 2       4       1       7

$ sysctl kernel.printk

kernel.printk = 1       4       1       7 

$ lscpu

Architecture:          armv7l

Byte Order:            Little Endian

CPU(s):                4

On-line CPU(s) list:   0-3

Thread(s) per core:    1

Core(s) per socket:    4

Socket(s):             1