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Re: VTK與OPENGL-ES在embedded linux繪製問題

[ LinuxDev ]10 留言, 推噓總分: +3

作者: hizuki - 發表於 2019/06/28 10:44(6年前)

7^F→wens: 要不試試看 mainline kernel + mainline mesa 用 panfrost?07/02 01:44

8^F→wens: 這是個大坑就是了07/02 01:44

[問題] 大量連線數如何降低I/O 提升傳輸速度

[ LinuxDev ]15 留言, 推噓總分: +2

作者: sunfox - 發表於 2019/05/02 17:43(6年前)

9^F→wens: 這不是經典題目嗎? C10K05/14 00:04

14^F→wens: 一直開關 thread 也是有成本的06/04 14:19

[問題] kernel module 區域變數記憶體

[ LinuxDev ]57 留言, 推噓總分: +6

作者: dces4212 - 發表於 2019/03/27 03:29(6年前)

1^F→wens: array 是 struct xxx XXX[N] 宣告? copy_to_user 呼叫方法呢03/27 16:17

2^F→wens: 要問 code 就要把 code 貼出來，不要請人隔空抓藥...03/27 16:18

5^F→wens: 不太相干的事情: 不要用 VLA, 很容易爆 stack03/28 00:17

8^F→wens: 你出現錯誤的時候 g 是多少? 我覺得可能是你 stack 爆了去踩03/28 00:35

9^F→wens: 到 text section ...03/28 00:35

10^F→wens: 看 mm/usercopy.c 應該是沒大到踩到 text section 不然錯誤03/28 00:49

11^F→wens: 訊息不太一樣，而且中間踩到 unmapped page 應該會先炸03/28 00:50

12^F→wens: 看起來像是 x86 上超出 stack frame 之類的03/28 00:51

13^F→wens: 乖乖用 kmalloc 吧03/28 00:51

14^F→wens: 對吼... 應該要請你附 backtrace 跟解析過的行數才對XD03/28 10:52

15^F→wens: arch_within_stack_frames 好像 x86 才有實作03/28 10:52

18^F→wens: 對啊 # backtrace 是指 call stack 跟dump出的register03/28 15:56

[問題] Makefile about building kernel module

[ LinuxDev ]1 留言, 推噓總分: +1

作者: TMDTMD2487 - 發表於 2019/03/20 16:08(7年前)

1^F推wens: 可以直接看 scripts/Makefile.lib ?03/20 16:17

[問題] Kernel module 相關問題

[ LinuxDev ]10 留言, 推噓總分: +1

作者: dces4212 - 發表於 2019/03/17 20:32(7年前)

5^F→wens: 你要 stdint.h 幹嘛?03/18 17:12

Re: [問題] pine a64

[ LinuxDev ]2 留言, 推噓總分: -1

作者: yuming8587 - 發表於 2017/11/15 21:00(8年前)

1^F→wens: tinkerboard 也差不多要過時了... 大家都往 ARMv8 跑了11/16 11:09

[問題] 開發板是否需要"開源硬體"?

[ LinuxDev ]11 留言, 推噓總分: +4

作者: timemaker - 發表於 2017/09/03 16:15(8年前)

2^F→wens: 開源硬體一部分是板子的layout圖檔設計檔什麼都給你09/03 23:30

3^F→wens: 你可以自己沿用並變更設計然後拿去生產09/03 23:31

[問題] 關於 kernel driver interrupt ISR

[ LinuxDev ]36 留言, 推噓總分: +2

作者: gn00618777 - 發表於 2017/03/08 17:50(9年前)

1^F→wens: 不能等 buffer 滿了才送 interrupt 啊, 大概 1/2 ~ 3/4 滿03/09 10:49

2^F→wens: 就該送了。interrupt handler沒有保證馬上執行的03/09 10:49

18^F→wens: 沒設ONE_SHOT會更崩潰，而且SPI bus一次也只能一個存取啊03/13 00:09

19^F→wens: 我說的buffer指的是MCU上的buffer。舉一些I/O裝置為例，通常03/13 00:10

20^F→wens: 會內建個FIFO，可以存一點資料，然後可以設定要滿到什麼程度03/13 00:10

21^F→wens: 的時候發 interrupt或DRQ (DMA的狀況)03/13 00:11

22^F→wens: AP這端我覺得你沒太多可以做的，因為你就是沒辦法在top half03/13 00:12

23^F→wens: 做IO去讀資料出來，而且即便是top half也沒保證馬上輪到你，03/13 00:12

24^F→wens: 其他的ISR 也會擋你啊03/13 00:12

35^F→wens: 如果沒有要在 thread 裡面做，那似乎無所謂?03/17 16:50

36^F→wens: 然後top half不能讀資料確實是 API 限制沒錯 (SPI可能sleep)03/17 16:51

[問題] device tree i2c bus add gpio

[ LinuxDev ]11 留言, 推噓總分: +1

作者: wads5566 - 發表於 2017/02/24 17:44(9年前)

3^F→wens: 要看該裝置的 device tree binding02/25 23:40

如何在kernel裡定期偵測gpio狀態？

[ LinuxDev ]12 留言, 推噓總分: +4

作者: sm9195 - 發表於 2017/01/09 12:41(9年前)

2^F→wens: interrupt 要 gpio 支援 interrupt, 不然就用 task / worker01/09 14:17

3^F→wens: 看看 mmc core 用 gpio 做 card detect 的做法吧01/09 14:17

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