Hi all,
On Wed, Oct 8, 2014 at 10:35 AM, Chin Liang See <cl...@altera.com> wrote: > On Sun, 2014-10-05 at 22:55 +0200, ma...@denx.de wrote: >> On Sunday, October 05, 2014 at 10:35:06 PM, Maxime Hadjinlian wrote: >> > On Sun, Oct 5, 2014 at 10:28 PM, Marek Vasut <ma...@denx.de> wrote: >> > > On Sunday, October 05, 2014 at 09:51:27 PM, Maxime Hadjinlian wrote: >> > >> On Sun, Oct 5, 2014 at 9:45 PM, Marek Vasut <ma...@denx.de> wrote: >> > >> > On Sunday, October 05, 2014 at 09:27:00 PM, Maxime Hadjinlian wrote: >> > >> >> On Sun, Oct 5, 2014 at 9:19 PM, <thomas.lan...@lantiq.com> wrote: >> > >> >> >> On Sunday, October 05, 2014 at 08:40:26 PM, Maxime Hadjinlian >> > >> >> >> wrote: >> > >> >> >> > Hi Thomas, all, >> > >> >> >> > >> > >> >> >> > On Sun, Oct 5, 2014 at 7:43 PM, <thomas.lan...@lantiq.com> >> > >> >> >> > wrote: >> > >> >> >> > > Hello Maxime, >> > >> >> >> > > >> > >> >> >> > > can you explain the usecase? >> > >> >> >> > > I think, only the erase is executed per sector, all other >> > >> >> >> > > commands are working fine with a byte oriented length. >> > >> >> >> > >> > >> >> >> > I need to write a file that is downloaded through TFTP. So I can >> > >> >> >> > get the filesize through the variable of the same name, but if >> > >> >> >> > it's not rounded, the write command may fail. >> > >> >> >> > I can save the filesize in another variable, but at next boot, >> > >> >> >> > when I need to read this file, I can't read the file, since I >> > >> >> >> > only know it's size in byte, I need to be able to round it >> > >> >> >> > again. >> > >> >> >> >> > >> >> >> I wonder, do all SPI flashes need to do sector-aligned writes ? >> > >> >> > >> > >> >> > All the serial flashes I have seen so far do support reading and >> > >> >> > writing with any length, independent from the erase size. >> > >> >> > Otherwise the current implementation of env_sf.c would also not >> > >> >> > work. >> > >> >> >> > >> >> Well the QSPI, I used, does not. Every read and write has to be >> > >> >> aligned. That's why I needed that in the first place. >> > >> > >> > >> > Aligned how exactly? >> > >> >> > >> sector-aligned. >> > >> If I write anything that is not sector aligned, the 'sf' command will >> > >> fail. >> > > >> > > Is that really a property of the SPI flash or the SPI controller ? And if >> > > the later, is it a property of a particular one or is that a common >> > > thing ? >> > >> > I'll have to check but if I remember correctly, it's the SPI flash. >> > It's a Micron Serial NOR flash (N25Q512A83G1240x). >> > And the controller is the Cadence QSPI controller available on the SoC >> > FPGA platform. >> > Maybe what caused my issues was the driver after all ? >> >> +CC Altera guys, they might help too. > > Hmmm.... quite strange to write for sector aligned. > Wonder the write related to filesystem access? > > Within Cadence QSPI controller, read and write access need to be done > within a page. But that would be taken care by controller when the > access beyond the next page. From software perspective, we just tell > controller the numbers of bytes to be transfer (for indirect transfer > setup). My needs have evolved a bit, and I no longer require this function. But I wasn't able to right a file tftp into RAM using 'sf update' without this patch. I could try to reproduce the errors and maybe dig in a little more. > > Chin Liang > >> >> Best regards, >> Marek Vasut > > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
