Power Management ????????

1
Power Management????????

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

2
??

• ???????????????????

HW???
???? ???? init
?????????????
(Boot loader / kernel)
1 s
1 s
2 s
5 s

• ????????? main() ??????????????
• ???????
• ?????????
• ????????????
• ??????????????????????? IPC ??

3
?????

• ?????????????????
• prelink
• ????????????????????
• ???????????????(????????)
• Execute in place (XIP)
• Data ???????????????(????????????)

4
?????

• hibernate ??????????
• ? BIOS (Boot loader)???
• ? Kernel ???
• ? BIOS kernel

5
??ｷ????????
KERNEL
I/O save
Image save
I/O init
Image restore
I/O rest.
BOOT LOADER
OFF
ON
6
??ｷ????????
KERNEL
I/O save
Image save
I/O init
Image restore
boot
I/O rest.
I/O s.d.
BOOT LOADER
OFF
ON
7
??ｷ????????
KERNEL
I/O save
img save
I/O init
img rest
I/O rest.
I/O save
img save
I/O init
img rest
I/O rest.
BOOT LOADER
BOOT LOADER
OFF
ON
8
??????

• ? BIOS (Boot loader)???
• Hibernate ????????
• ???????????????????????
• ? Kernel ???
• Hibernate ????????????????????
• Hibernate ?????????
• ? BIOS kernel
• ??? Hibernate ??
• ????????????????

9
?????

• ???????
• Boot loader ??????????? kernel ?? un-hibernate
  ????????
• DEFERRED_RESUME
• ??????????????????
• ???????????
• ??????????????
• ???
• ????
• Splash window
• ?????????

10
Linux ?? hibernate

• Swsusp
• 2.6 ??????????????(Documentation/power/swsusp.txt
  )
• ???Pavel Machek
• Software suspend 2
• http//www.suspend2.net/
• ???Nigel Cunningham

11
Linux ?? hibernate(??)
swsusp
suspend2
architecture i386, ppc, x86_64, ia64 i386, ppc, x86_64
Discontiguous memory ? ﾗ
Compression ﾗ ?
Encryption ﾗ ?
Suspend-to-swapfile ﾗ ?
Suspend-to-file ﾗ ?
Userland ???? ﾗ ?
?? http//www.suspend2.net/features
12
??

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

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
13
????

• Linux ? hibernate ???
• ??? swsusp ???
• ARM ????????
• FLASH ?? hibernate
• ???????????
• ?????????
• Boot loader ?? hibernate
• DEFERED_RESUME

14
??

• Suspend2???
• ???????????
• ????????????
• Suspend2 ? ARM ??????
• U-boot ???
• Boot loader ?? hibernate

15
??
16
??????

• Suspend2 ML ? Arm ??????????????????????
• Arm ML ???ｷ????????????????????

17
EOF
18
??????????