On 3/4/2010 5:58 PM, Wolfgang Denk wrote: > Dear Vipin KUMAR, > > In message <4b8f8c3f.6050...@st.com> you wrote: >> >> This query is wrt NAND 8/16 bit device support at runtime. Currently, >> the u-boot code can support only one of these at a time. > > Yes, indeed. I have yet to see a piece of hardware which implements > both 8 and 16 bit interfaces on a single board. Hardware designers > often have funny ideas, but this seems to be too weird even for them > ;-) > >> Although it matches the buswidth selected through chip->options and the >> the buswidth of device id it reads and returns an error if they don't >> match, probably a better way can be to reinitialize NAND controller >> based on 16 bit device and re-read the device id. > > Why would that be needed? Do you really expect to see both types of > interfaces on the same piece of hardware? >
Yes, that's precisely the case with Spear SoC. It has an FSMC controller embedded in it. FSMC can support 8 as well as 16 bit devices(off-course with different initializations) for different banks > > Otherwise you just have misconfigured your board, and fixing the > configuration should all that is needed to make the code work. Or am > I missing something? > I could make the code work with both 8 as well as 16 bit devices. The only thing is that I have to make a few changes and rebuild the uboot for a particular interface > Best regards, > > Wolfgang Denk > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
