U-Boot for Raspberry Pi

ulovko

FROM: http://kernelnomicon.org/?p=133

About Raspberry Pi : http://en.wikipedia.org/wiki/Raspberry_Pi



NetBSD on the Raspberry Pi
The Raspberry Pi is a pretty recent, cheap ARM-based board, or as the webpage says: ``An ARM GNU/Linux box for $25''.
Shipping with today's Windows-for-embedde-boards operating system (AKA Linux), there's also a port of NetBSD on its way.
Nick Hudson is at it, and he has posted first dmesg output now, showing the machine going to multiuser mode.
The code's not integrated into mainline NetBSD-current yet, but rest assured that that will happen when the code is ripe.
Good work, Nick!

Disclaimer: All opinion expressed here is purely my own. No responsibility is taken for anything.
FROM: http://www.feyrer.de/NetBSD/bx/blosxom.cgi/nb_20120714_0236.html

gvim

arm11淘汰了...现在都跟着手机玩cortex了.能效比好得多

ulovko

gvim 发表于 2012-07-20 02:47
arm11淘汰了...现在都跟着手机玩cortex了.能效比好得多

多谢版主指教 ^_^

unixlinuxsys

ARM11 vs Cortex A8 vs Cortex A9 - Netbooks processors

You may remember that an Intel executive (one year ago or so) in an interview said that the Internet browsing experience in the iPhone is not that good because an ARM processor is used instead of an Intel Atom. Of course this sentence is a pure provocation since the Atom processors weren't (and still aren't) suitable for handsets: they are too power hungry.
The first iPhones 2G and 3G included a Samsung SoC based on the ARM11 core clocked at about 600MHz, much more power efficient than actual Atoms. On the other hand Atom processors are definetly more powerful than ARM11 processors.
In the past couple of years ARM introduced Cortex A8 and Cortex A9 cores, processors able to reach and potentially beat Intel Atom.

Just to give an example showing how "bad" the ARM11 compared to the new Cortex, I report the peak DMIPS/MHz. It is a clock-per-clock performance indication of the processor (used especially for Marketing purpose)

    ARM11: 1.2 DMIPS/MHz
    ARM Cortex A8: 2.0 DMIPS/MHz
    ARM Cortex A9: 2.5 DMIPS/MHz

There is a huge performance difference between older ARM11 cores and the new ARM Cortex A8 and Cortex A9.

Example of devices using the ARM cores
Apple iPhone 3G uses an ARM11 processor while the iPhone 3GS an ARM Cortex A8.
The ARM Cortex A8 is also used in Qualcom Snapdragon and NXP i.MX515 SoCs.
The first ARM Cortex A9 based SoCs (System on a Chip) are expected in 2010.
Nvidia Tegra 1 is based upon an ARM11 and it's unknown whether or not in Tegra 2 an ARM11 or a Cortex A8 / Cortex A9 will be used.

axlrose

要玩的话，可以试试
http://beagleboard.org/bone/ 狗骨头小板子
TI的资料很全，源代码开发的也挺好, 不过这芯片还有点贵，1KK的量才是5美金,拿来玩的话没啥
还有个基于OMAP4430, OMAP4460的板子，那个跑起来就更欢快些