On Sunday, October 05, 2014 at 10:35:06 PM, Maxime Hadjinlian wrote:
On Sun, Oct 5, 2014 at 10:28 PM, Marek Vasut marex@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 marex@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.langer@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.langer@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.
Best regards, Marek Vasut