Hi Lothar,

Hi,

Huang Shijie writes:

quoted

Hi,
   add more CC.

quoted

Hi,

Huang Shijie writes:

quoted

The patch set is based on Artem's tree:
	http://git.infradead.org/users/dedekind/l2-mtd-2.6.git

The general-purpose media interface(GPMI) controller is a flexible interface
to up to several NAND flashs.

The Bose Ray-Choudhury Hocquenghem(BCH) module is a hardware ECC accelerator.

With the help of BCH, the GPMI controller can choose to do the hardware ECC or
not.

This driver is a _pure_ MTD NAND controller driver now.


The driver depends on another GPMI-NAND device patch set, you can find them at :
	[1] http://marc.info/?l=linux-arm-kernel&m=131416901319573&w=2
	[2] http://marc.info/?l=linux-arm-kernel&m=131416912319668&w=2
	[3] http://marc.info/?l=linux-arm-kernel&m=131416891119504&w=2
	[4] http://marc.info/?l=linux-arm-kernel&m=131416896219539&w=2

Test environment:
	Using imx23 and imx28 boards for test.

	imx23 :
	console=ttyAMA0,115200 mtdparts=gpmi-nfc:20m(boot),-(user)
	Tested by USB boot and NAND boot.

          imx28 :
	#console=ttyAMA0,115200 root=/dev/mmcblk0p3 rw rootwait
	Tested by SD card boot mode.

How did you perform your tests?

I tried this driver on our TX28 board with the result that with

The nand conflicats with SD card1. You will get the DMA timeout if you
use it.
Do you use sd card0 or sd card1?

I'm using the SSP0 port.

quoted

BTW:I tested the gpmi driver with SD card0. It works fine.

What exactly did you do in your test?
Can you try the concurrent 'dd' commands that I used?

I tested the following :
   #dd if=/dev/mmcblk0 > /dev/null

[943147.630000] mmcblk0: error -110 transferring data, sector 3972320, nr 256, cmd response 0x900, card status 0x80b00
[943147.640000] mmcblk0: retrying using single block read
[943158.250000] mmcblk0: error -110 transferring data, sector 3972480, nr 96, cmd response 0x900, card status 0x0
[943158.260000] end_request: I/O error, dev mmcblk0, sector 3972480
[943168.780000] mmcblk0: r/w command failed, status = 0x80900
[943168.790000] end_request: I/O error, dev mmcblk0, sector 3972481
[943168.790000] Buffer I/O error on device mmcblk0, logical block 496560
[943168.790000] end_request: I/O error, dev mmcblk0, sector 3972488
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496561
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972496
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496562
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972504
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496563
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972512
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496564
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972520
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496565
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972528
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496566
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972536
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496567
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972544
[943168.810000] Buffer I/O error on device mmcblk0, logical block 496568
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972552
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972560
[943168.810000] end_request: I/O error, dev mmcblk0, sector 3972568
[943179.450000] mmcblk0: error -110 transferring data, sector 3972480, nr 8, cmd response 0x900, card status 0x80b00
[943179.460000] mmcblk0: retrying using single block read
[943189.990000] mmcblk0: error -110 transferring data, sector 3972480, nr 8, cmd response 0x900, card status 0x0
[943190.000000] end_request: I/O error, dev mmcblk0, sector 3972480
[943200.530000] mmcblk0: r/w command failed, status = 0x80900
[943200.530000] end_request: I/O error, dev mmcblk0, sector 3972481
[943200.530000] quiet_error: 3 callbacks suppressed
[943200.530000] Buffer I/O error on device mmcblk0, logical block 496560
dd: /dev/mmcblk0: Input/output error
root at freescale ~$
-------------------------------------------------------------------------------------------------

It seems only test the SD card also can reproduce the same DMA bug.

Best Regards
Huang Shijie

Lothar Wa?mann