這幾天真的想超多…想超遠，想著自己還有很多未完成的事
想著要怎麼交待自己的後事
我還想著如果醫生真的宣布我中獎… 我不知道會不會腳軟
誰又會在我身邊 一起聽這個壞消息? 她又會是什麼反應?
電視的職棒，床上的老伴在睡
我喜歡這個時刻: 明明有人陪，有吵雜的電視，但還可以偷到與自己相處的小時光
買了 dyson，買了濾水壺 ，希望能讓身旁的人健康，盡自己一點心力
2013年4月6日 星期六
2013年3月30日 星期六
2013年3月23日 星期六
2013年3月21日 星期四
2012年10月8日 星期一
GDB script
http://wiki.csie.ncku.edu.tw/embedded/schedule
很有趣的lab... by jserv
1.用qemu模擬某個板子
2.寫個app去call driver API讓 UART 顯示 hello
3.看似簡單，但實際要比賽誰的app寫的短…(處理動作最好全權交給 GDB)
4.方法: 透過 gdb 來追蹤程式
很有趣的lab... by jserv
1.用qemu模擬某個板子
2.寫個app去call driver API讓 UART 顯示 hello
3.看似簡單，但實際要比賽誰的app寫的短…(處理動作最好全權交給 GDB)
4.方法: 透過 gdb 來追蹤程式
2012年7月3日 星期二
"轉" SSD的初使化 (用hdpara去erase整個SSD)
原文:http://superuser.com/questions/283590/restoring-performance-and-estimating-life-of-a-used-ssd-drive
passing the block ranges you want to TRIM instead of
start and count and the SSD device in place of /dev/sda. It has the advantage of being fast and not writing zeros on the drive. Rather, it simply sends TRIM commands to the SSD controller letting it know that you don't care about the data in those blocks and it can freely assume they are unused in its garbage collection algorithm.
You probably need to run this command as root. Since this command is extremely dangerous, as it can immediately cause major data loss, you also need to pass
--please-destroy-my-drive argument tohdparm (I haven't added this to the command line to prevent accidental data loss caused by copy and paste.)
In the above command line,
/dev/sda should be replaced with the SSD device you want to send TRIM commands to. start is the address of the first block (sector) to TRIM, and count is the number of blocks to mark as free from that starting address. You can pass multiple ranges to the command.
Having personally done it with hdparm v9.32 on Ubuntu 11.04 on my laptop with a 128GB Crucial RealSSD C300, I have to point out an issue: I was not able to pass the total number of disk blocks (0:250069680) as the range. I manually (essentially "binary searched" by hand) found a large enough value for block count that worked (40000) and was able to issue TRIM commands on a sequence of 40000 ranges to free up the entire disk. It's possible to do so with a simple shell script like this (tested on Ubuntu 11.04 under root):
# fdisk -lu /dev/sda
Disk /dev/sda: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 sectors
...
to erase the entire drive, take that total number of sectors and replace 250069680 in the following line with that number and run (add
--please-destroy-my-drive): # i=0; while [ $i -lt 250069680 ]; do echo $i:40000; i=$(((i+40000))); done \
| hdparm --trim-sector-ranges-stdin /dev/sda
And you're done! You can try reading the raw contents of the disk with
hexedit /dev/sda before and after and verify that the drive has discarded the data.
Of course, even if you don't want to use Linux as the primary OS of the machine, you can leverage this trick by booting off a live CD and running it on the drive.
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