[PATCH v8 0/3] add the GPMI controller driver for IMX23/IMX28

[Marek Vasut]

On Friday, July 29, 2011 05:00:48 PM Koen Beel wrote:
> On Fri, Jul 29, 2011 at 2:41 PM, Lothar Waßmann <LW at karo-electronics.de> 
wrote:
> > Hi,
> > 
> > Koen Beel writes:
> >> Hi,
> >> 
> >> On Fri, Jul 29, 2011 at 9:20 AM, Lothar Waßmann <LW at karo-electronics.de> 
wrote:
> >> > Hi,
> >> > 
> >> > Koen Beel writes:
> >> >> Hi,
> >> >> 
> >> >> I have test on mx23evk board. Still see the same issues.
> >> >> 
> >> >> On Wed, Jul 27, 2011 at 3:53 AM, Huang Shijie <b32955 at freescale.com> 
wrote:
> >> >> > Hi,
> >> >> > 
> >> >> > Thanks for your test.
> >> >> > 
> >> >> >> Hi,
> >> >> >> 
> >> >> >> It's not really working for me.
> >> >> >> I've applied all gpmi-nand driver patches and the dma driver
> >> >> >> patches.
> >> >> >> 
> >> >> >> I have added following kernel parameters:
> >> >> >> mtdparts=gpmi-nand:20m(boot),-(user) ubi.mtd=1 root=ubi0:rootfs0
> >> >> >> rootfstype=ubifs gpmi_debug_init
> >> >> >> 
> >> >> >> During boot I get already get DMA timeout:
> >> >> >> [    2.560000] [ start_dma_without_bch_irq : 392 ] DMA timeout,
> >> >> >> last DMA
> >> >> >> 
> >> >> >> :1
> >> >> >> 
> >> >> >> [    3.560000] [ start_dma_with_bch_irq : 427 ] bch timeout!!!
> >> >> >> ...
> >> >> >> (see log file in attach line 89)
> >> >> 
> >> >> I still see this DMA timeout when booting.
> >> >> What kernel parameters do you use? I still use same as above.
> >> > 
> >> > Do you have an SD card in the system? I'm getting the same error when
> >> > accessing an SD card. Without SD card I can use the flash without any
> >> > errors.
> >> 
> >> No SD card in the system. At least not on my mx23evk board.
> >> My real target hardware has a SDIO wifi chip.
> >> 
> >> Are you also testing on the mx23evk board? Really strange it is not
> >> reproducible here then.
> >> Anyone using mx23evk please give:
> >> - revision number of board (I have tested on rev C1)
> >> - kernel parameter used (see previous mail for mine)
> > 
> > It's getting ever more strange. I only have problems with concurrent
> > access to the flash and SD-card when I do file system based accessed
> > to the SD card.
> > A 'dd if=/dev/mmcblk0 of=/dev/null' while excessively using the flash
> > works well, while mounting the SD card and doing an 'ls' produces
> > immediate BCH DMA timeouts.
> > 
> > Perhaps someone can make anything out of that.
> 
> I have checked and the function dma_irq_callback is never called
> during my tests. This means the DMA transfer does not even works once.
> 
> Also no clue here ...

Aren't you getting some undervolt on the powerrail for example ? btw the driver 
looks a bit crappy to me, but let's believe it works ;-)

> 
> > Lothar Waßmann
> > --
> > ___________________________________________________________
> > 
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> > 
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> > ___________________________________________________________
> 
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