Specifications

... console=tty0 console=ttyS0,${baudrate} ...
This will ensure that the boot messages are displayed on both the framebuffer (/dev/tty0) and the serial
console (/dev/ttyS0); the last device named in a console= option will be the one that takes input,
too, so with the settings above you can use the serial console to enter commands etc. For a more
detailed description see
http://www.tldp.org/HOWTO/Remote-Serial-Console-HOWTO/configure-kernel.html
14.3.15. How to switch off the screen saver and the
blinking cursor?
Question:
I'm using a splash screen on my frame buffer display, but it is disturbed by a blinking cursor, and after
a while the screen is blanked. How can I prevent this?
Answer:
Screen saver and blinking cursor can be turned off (and on) using escape sequences.
To turn off the screen saver, send the sequence "\E[9;0]" to the terminal ="/dev/tty1". For
example, output the content of file "/etc/blank_off" in one of your init scripts:
# cat /etc/blank_off
To turn off the blinking cursor, send the sequence "\E[?25l\E[?1c" to the terminal. For
example, copy the content of file "/etc/init_tty" to the terminal:
# cat /etc/init_tty
For details, please see "man 4 console_codes" .
14.3.16. BogoMIPS Value too low
Question:
We are only seeing 263.78 bogomips on a MPC5200 running at 396 MHz.
Doesn't this seem way to low ?? With a 603e core I'd expect 1 bogomip per MHz or better.
Answer:
No, the values you see is correct. Please keep in mind that there is a good reason for the name
BogoMIPS.
On Power Architecture®, the bogomips calculation is measuring the speed of a dbnz instruction. On
some processors like the MPC8xx it takes 2 clocks per dbnz instruction, and you get 1
BogoMIP/MHz. The MPC5200 takes 3 clocks per dbnz in this loop, so you get .67 BogoMIP/MHz.
See also The frequently asked questions about BogoMips (note: this document is somewhat outdated).
Question:
But I have a MPC8572 running at 1.5GHz, amd it shows only 150 bogomips. This cannot be correct?
Answer:
This value is indeed correct.
"With recent kernels, when build with ARCH=powerpc, we now use the hardware timebase instead of
bogus processor loops for short timings. Thus our bogomips value is no longer the speed at which the
processor runs empty loops, but the actual processor timebase value as obtained after calibration at
14.3.16. BogoMIPS Value too low 181