<SNIP> and if i use flash SST - SST39VF3201(4MB), I was getting message like this Internal flash device timeout occurred or write operation was performed while flash was programming. i think i was getting these warnings as SST flash is little faster than Spansion. When i was using CFI probe, the chip was not getting detected. So i used JEDEC Probe. and I added busy checking using DQ7 also with DQ6 and DQ5, instead of only DQ6(Toggling) and DQ5 , in the cfi_cmdset_0002.c, for avoiding these warnings Now both SST and Spansion chips are working fine. I don't know whether what i did is 100% correct, but it is correct according to datasheets of these IC's. Now i am not facing any issues in flash(With JEDEC probe) And SST flash which i used is having very good flash erase timings compared to others which i used Regards Steven
<SNIP> Hello Steven, This is regarding the modification of "cfi_cmdset_0002.c" file for DQ5 / DQ7 bit check issues during write and erase to make proper use of SST39VF3201 flash chips. (refer to mail list info above.) I also found a post from you on "http://osdir.com/ml/uclinux.devel/2005-12/msg00246.html"; in which you have mentioned the modifications to be tried out for DQ7 check. <SNIP> I added DQ7 checking also in the program/erase busy check sequence in erase in cfi_cmdset_0002.c dq7 = CMD(1<<7);//Steven Added dq6 = CMD(1<<6); dq5 = CMD(1<<5); oldstatus = cfi_read(map, adr); status = cfi_read(map, adr); #if 0 while( ((status & dq6) != (oldstatus & dq6)) && ((status & dq5) != dq5) && !time_after(jiffies, timeo)) { #endif while( ((status & dq7) == 0) && !time_after(jiffies, timeo)){ try this once regards Steven <SNIP> I tried the above suggestion but didn't work quite well. it still kept throwing out DQ5 raised warning. Will be trying it out additional changes shortly. Has anyone implemented any further patch or code since then for supporting this SST flash. Would it be possible for someone to give the patch for it or at least put up part of the modified code online. Further with reference to DQ7 checking. I wonder what happens when the chip is in erase or write cycle for too long. unlike DQ5 for AMD chips there is nothing mentioned in datasheet which indicates this situation. Inputs from you will be greatly appreciated. Regards, Bruno P. Lasrado ================================================================
_______________________________________________ uClinux-dev mailing list [email protected] http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by [email protected] To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
