PowerQUICC ProcessorsのトピックMPC8309 SDdriver

MPC8309 SDdriver

田曙亮 — Wed, 29 Jul 2015 07:37:38 GMT

I use mpc9309 linux2.6.34. When i use sdcard driver, i find sd driver use poll to detect sdcard.

This will cause a problem that if sd is not exist, it will cause many sd cmd intterupt.

I want to know that if this question had been resolved in other linux version.

thanks.

Re: MPC8309 SDdriver

Pavel — Mon, 17 Aug 2015 04:54:52 GMT

Look at the Section 2.5 of the AN10911 from NXP (http://www.nxp.com/documents/application_note/AN10911.pdf).

There are two methods for SD/MMC card detection.

The driver uses SD_CD pin for card detection.

Look at the bits CRM and CINS and CINTSEN bits in the Chapter 12 of the MPC8309 Reference Manual.

Description of these bits does not recommend using interrupt for card insertion.

Have a great day,
Pavel

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Re: MPC8309 SDdriver

田曙亮 — Thu, 10 Sep 2015 01:48:50 GMT

Thanks Pavel