MPC8309 SDdriver

[田曙亮]

hi

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.

[Pavel · Accepted solution]

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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[田曙亮]

Thanks Pavel