1. 2006/JAN/20JapanTechnicalJamboree61 Improvement of bootup time using Power Management - Project Update - Hiroki Kaminaga Sony Corporation kaminaga@sm.sony.co.jp

2. 2006/JAN/20JapanTechnicalJamboree62 Summary ： Studied to make bootup time faster using Suspend-to-disk technology Saving snapshot in each phase during development (e.g. for verification)

3. 2006/JAN/20JapanTechnicalJamboree63 Stories so far ： Ported swsusp function onto ARM –Kernel: 2.6.11 Ported suspend2 function onto ARM (suspend2-2.2-rc9) –Kernel: 2.6.14

4. 2006/JAN/20JapanTechnicalJamboree64 Status of Suspend2 ： 2.2-rc9: Already ported onto ARM 2.2-rc13: ARM support was incorporated in suspend2 2.2-rc16: Now debugging ARM version （ Now very hot ） Evaluated on 2.2-rc14 for today’s presentation （ The Latest version whose operation is confirmed ）

5. 2006/JAN/20JapanTechnicalJamboree65 Environment ： Target Board –OMAP Starter Kit (OSK 5912) OS –Linux 2.6 Boot loader –U-boot Image destination –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. 2006/JAN/20JapanTechnicalJamboree66 Measurement ： Used printk times $ make menuconfig Kernel hacking ---> [*] Show timing information on printks

7. 2006/JAN/20JapanTechnicalJamboree67 Measurement Results ： ashmplayer un-hibernate start [sec]3.59193733.591987 un-hibernate end [sec]12.32175415.941194 un-hibernate delta [sec]8.72978112.349207 read data delta [sec]2.1832522.185462 read cache delta [sec]2.5620885.995782 read total delta [sec]4.7453408.181244 other [sec]3.9844414.167963 image size [MB]11.7968720.61718 read speed [MB/sec]2.48592.5200 Log…

8. 2006/JAN/20JapanTechnicalJamboree68 Read Speed of NOR FLASH ： MT28F128J3FS-12 ET –16 bit / 120ns Read Cycle （ From Datasheet ） → 15.894 MB/s –$ time dd if=/dev/mtdblock3 of=/dev/null \ bs=1024 count=10240 user 0.07 sys 2.25 → 4.44 MB/s

9. 2006/JAN/20JapanTechnicalJamboree69 Issues ： Bottleneck analysis using performance analyzer etc. →to reduce bootup time Debugging tool →to analyze bug of rcXX →LKST? LTT? SystemTap?

10. 2006/JAN/20JapanTechnicalJamboree610 Misc. ： To speed up the image reading with DMA transfer? To start Un-hibernate earlier? Collaboration with boot loader

11. 2006/JAN/20JapanTechnicalJamboree611 EOF