Dear prakash bedge, In message <aanlktilsrq2jt8a2d9lczd1ujhra_3bcofqojphin...@mail.gmail.com> you wrote: > > >> Be careful. 1024 s is chip erase time, but we use sector erase only, so > it's only 3.5 seconds. > It would be really helpful if you please explain how 3.5 seconds come; since > the S29GL512P datasheet says sector erase operation time is 0.5 seconds and > program operation time is 64 microseconds.
The data sheet "S29GL-P MirrorBit® Flash Family" (see http://www.spansion.com/Support/Datasheets/S29GL-P_00_A12_e.pdf) reads in "Table 11.8 Erase And Programming Performance" (page 67): Parameter Typ Max Unit Comments Sector Erase Time 0.5 3.5 sec So the 0.5 seconds you are referring to is the "Typical program and erase times assume the following conditions: 25°C, 3.6 V VCC, 10,000 cycles, checkerboard pattern." The 3.5 seconds I listed was " Under worst case conditions of -40°C, VCC = 3.0 V, 100,000 cycles." Obviously it is necessary to adjust this timeout for worst case conditions. > What values I should put in my config file? > #define CONFIG_SYS_FLASH_ERASE_TOUT ?? /* Timeout for Flash Erase (in > ms) */ I would use 5000 here (i. e. 5 seconds, which is 3.5 plus some safety margin). > #define CONFIG_SYS_FLASH_WRITE_TOUT ?? /* Timeout for Flash Write (in ms) */ Here we have to calculate the timing based on the Write Buffer Programming Time. > I seen canyonlands.h and I think it is also 64 MB flash. ... > #define CONFIG_SYS_FLASH_ERASE_TOUT 120000 /* Timeout for Flash Erase (in > ms) */ > #define CONFIG_SYS_FLASH_WRITE_TOUT 500 /* Timeout for Flash Write (in > ms) */ So - did you try using these values? And did they not work for you? > But I myself is not geting satsifed why I should use these values since they > are not as per the flash datasheet. They are timeouts, and they are most ptobably defensively set. I don't understand your problem. Keep in mind that these timeouts don't play any role as long as the chip is working normally - they apply only in the error case. And if your flash chip cannot be erased or programmed any more it does not really matter if you find out after 3.5 or after 5 or even after 12 seconds - you will lose much more time after that ;-) Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de Death. Destruction. Disease. Horror. That's what war is all about. That's what makes it a thing to be avoided. -- Kirk, "A Taste of Armageddon", stardate 3193.0 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
