Improvement of bootup time using Power Management - Project Update -

1
Improvement of bootup time using Power Management
- Project Update -

• ????
• ????
• kaminaga_at_sm.sony.co.jp

2
??

• Suspend-to-disk ???????????????????
• ????????????????????(????????)

3
?????????

• swsusp ???? ARM ?????????
• Kernel 2.6.11
• Suspend2 ???? ARM ????????? (suspend2-2.2-rc9)
• Kernel 2.6.14

4
Suspend2 ???

• 2.2-rc9 ARM????????
• 2.2-rc13 Suspend2 ? ARM ???????????
• 2.2-rc16 ?? ARM ???????(??)
• ??? 2.2-rc14 ?????(?????????????)

5
??

• ????????
• OMAP Starter Kit (OSK 5912)
• OS
• Linux 2.6
• Boot loader
• U-boot
• Image ?????
• Flash ROM

Hardware Features ARM9 core operating at 192
Mhz. DSP core operating at 192 Mhz. TLV320AIC23
Stereo Codec 32 Mbyte DDR SDRAM 32 Mbyte Flash
ROM RS-232 Serial Port 10 MBPS Ethernet port
USB Host Port Compact flash connector On board
IEEE 1149.1 JTAG
6
????

• printk times ???? make menuconfig Kernel
  hacking ---gt Show timing
  information on printks

7
????
ash mplayer
un-hibernate start sec 3.5919373 3.591987
un-hibernate end sec 12.321754 15.941194
un-hibernate delta sec 8.729781 12.349207
read data delta sec 2.183252 2.185462
read cache delta sec 2.562088 5.995782
read total delta sec 4.745340 8.181244
other sec 3.984441 4.167963
image size MB 11.79687 20.61718
read speed MB/sec 2.4859 2.5200
Log