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-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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 ma...@denx.de 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-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board
On 4 June 2015 at 00:53, Marek Vasut ma...@denx.de 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-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
