Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board
On Thursday, June 04, 2015 at 06:21:32 AM, Michal Suchanek wrote: > On 4 June 2015 at 00:53, Marek Vasut wrote: > > On Wednesday, June 03, 2015 at 11:26:39 PM, Michal Suchanek wrote: > >> Hello, > > > > Hi, > > > >> this patch series makes it possible to access the SPI NOR flash in the > >> Samsung XE303 'Snow' Chromebook. > >> > >> Unfortunately not all issues are resolved. To work around an issue with > >> the pl330 dma engine I respun the patch for limiting transfer size in > >> m25p80 driver. > > > > Looks like fixing a bug at the wrong place to me ... > > > >> As the flash does not contain any sane filesystem and is only likely to > >> be accessed with mtd_debug or similar tool the limit of the dma engine > >> is easily reached. Filesystems using shorter data transfers are less > >> likely to be affected. > > > > Sounds like the DMA engine driver should be fixed. > > I looked at the pl330 datasheet and don't see anything obviusly wrong > with the pl330 driver in Linux. > > Ideally it would be fixed but I have no idea what's wrong with it. Ask maybe Catalin from ARM to help you -- he might be able to point you to the right hardware guy. Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board
On 4 June 2015 at 00:53, Marek Vasut wrote: > On Wednesday, June 03, 2015 at 11:26:39 PM, Michal Suchanek wrote: >> Hello, > > Hi, > >> this patch series makes it possible to access the SPI NOR flash in the >> Samsung XE303 'Snow' Chromebook. >> >> Unfortunately not all issues are resolved. To work around an issue with the >> pl330 dma engine I respun the patch for limiting transfer size in m25p80 >> driver. > > Looks like fixing a bug at the wrong place to me ... > >> As the flash does not contain any sane filesystem and is only likely to be >> accessed with mtd_debug or similar tool the limit of the dma engine is >> easily reached. Filesystems using shorter data transfers are less likely >> to be affected. > > Sounds like the DMA engine driver should be fixed. I looked at the pl330 datasheet and don't see anything obviusly wrong with the pl330 driver in Linux. Ideally it would be fixed but I have no idea what's wrong with it. Thanks Michal -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board
On Wednesday, June 03, 2015 at 11:26:39 PM, Michal Suchanek wrote: > Hello, Hi, > this patch series makes it possible to access the SPI NOR flash in the > Samsung XE303 'Snow' Chromebook. > > Unfortunately not all issues are resolved. To work around an issue with the > pl330 dma engine I respun the patch for limiting transfer size in m25p80 > driver. Looks like fixing a bug at the wrong place to me ... > As the flash does not contain any sane filesystem and is only likely to be > accessed with mtd_debug or similar tool the limit of the dma engine is > easily reached. Filesystems using shorter data transfers are less likely > to be affected. Sounds like the DMA engine driver should be fixed. Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
