Re: [U-Boot] Flash Erase and Write timeout for S29GL512P
Hi,
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.
What values I should put in my config file?
#define CONFIG_SYS_FLASH_ERASE_TOUT ?? /* Timeout for Flash Erase (in
ms) */
#define CONFIG_SYS_FLASH_WRITE_TOUT ?? /* Timeout for Flash Write (in ms) */
I seen canyonlands.h and I think it is also 64 MB flash.
/*---
* FLASH related
*--*/
#define CONFIG_SYS_FLASH_CFI /* The flash is CFI compatible */
#define CONFIG_FLASH_CFI_DRIVER /* Use common CFI driver */
#define CONFIG_SYS_FLASH_CFI_AMD_RESET 1 /* Use AMD (Spansion) reset cmd */
#define CONFIG_SYS_FLASH_BANKS_LIST{CONFIG_SYS_FLASH_BASE}
#define CONFIG_SYS_MAX_FLASH_BANKS 1 /* max number of memory banks */
#define CONFIG_SYS_MAX_FLASH_SECT 512 /* max number of sectors on one
chip */
#define CONFIG_SYS_FLASH_ERASE_TOUT 12 /* Timeout for Flash Erase (in
ms) */
#define CONFIG_SYS_FLASH_WRITE_TOUT 500 /* Timeout for Flash Write (in
ms) */
But I myself is not geting satsifed why I should use these values since they
are not as per the flash datasheet.
Regards,
Prakash
On Fri, May 21, 2010 at 12:46 PM, Wolfgang Denk w...@denx.de wrote:
Dear prakash bedge,
In message aanlktil9beksr6mocucbgkxhjn-vkkdoaemnhiyjq...@mail.gmail.com
you wrote:
Flash chip I am using is S29GL512P and as per datasheet flash erase time
is
1024 Seconds and flash program time is 492 Seconds.
Be careful. 1024 s is chip erase time, but we use sector erase only,
so it's only 3.5 seconds.
Same for the 492 s - this is Chip Program Time which does not matter
here.
But, in Uboot, I am seeing that most boards have configured
CONFIG_SYS_FLASH_ERASE_TOUT
to 24 ms and CONFIG_SYS_FLASH_WRITE_TOUT to 200-400 ms range for
flash of size 1GB or moroe.
Can anyone please tell what value I should use for my chip.
The CFI driver accesses the flash in sectors only, so sector times
apply, not chip times.
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
Even if you aren't in doubt, consider the mental welfare of the per-
son who has to maintain the code after you, and who will probably put
parens in the wrong place. - Larry Wall in the perl man page
___
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Flash Erase and Write timeout for S29GL512P
Hi, Am 25.05.2010 10:31, schrieb prakash bedge: Hi, 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. Please see Datasheet 11.7.5: Sector Erase Time Typ = 0.5; max = 3.5 Unit = sec regards Andreas Bießmann ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Flash Erase and Write timeout for S29GL512P
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 UnitComments 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 12 /* 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
Re: [U-Boot] Flash Erase and Write timeout for S29GL512P
Hi, I got the answers. It was my negligence to miss the table. Sorry for taking your time.:) Thanks regards, Prakash Bedge On Tue, May 25, 2010 at 5:11 PM, Wolfgang Denk w...@denx.de wrote: 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 UnitComments 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 12 /* 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
Re: [U-Boot] Flash Erase and Write timeout for S29GL512P
Dear prakash bedge, In message aanlktil9beksr6mocucbgkxhjn-vkkdoaemnhiyjq...@mail.gmail.com you wrote: Flash chip I am using is S29GL512P and as per datasheet flash erase time is 1024 Seconds and flash program time is 492 Seconds. Be careful. 1024 s is chip erase time, but we use sector erase only, so it's only 3.5 seconds. Same for the 492 s - this is Chip Program Time which does not matter here. But, in Uboot, I am seeing that most boards have configured CONFIG_SYS_FLASH_ERASE_TOUT to 24 ms and CONFIG_SYS_FLASH_WRITE_TOUT to 200-400 ms range for flash of size 1GB or moroe. Can anyone please tell what value I should use for my chip. The CFI driver accesses the flash in sectors only, so sector times apply, not chip times. 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 Even if you aren't in doubt, consider the mental welfare of the per- son who has to maintain the code after you, and who will probably put parens in the wrong place. - Larry Wall in the perl man page ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
[U-Boot] Flash Erase and Write timeout for S29GL512P
Hi All, I am using 64MB CFI compliant flash on my board. For that I need to configure the erase and write timeout for this chip in configs/boardname.h file Flash chip I am using is S29GL512P and as per datasheet flash erase time is 1024 Seconds and flash program time is 492 Seconds. So CONFIG_SYS_FLASH_ERASE_TOUT should be 1024000 ms and CONFIG_SYS_FLASH_WRITE_TOUT should be 492000 ms. But, in Uboot, I am seeing that most boards have configured CONFIG_SYS_FLASH_ERASE_TOUT to 24 ms and CONFIG_SYS_FLASH_WRITE_TOUT to 200-400 ms range for flash of size 1GB or moroe. Can anyone please tell what value I should use for my chip. Regards, Prakash ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
