Hello All! After a quick look through the specs for At29C020 and At29C040A I realized that all these chips looks identical. The only difference is page size - 128 bytes at At29C010A and 256 bytes at 020 and 040 models.
So am I right then suggests that for enabling At20C010A chip I need only add few lines -
{"At29C010A", ATMEL_ID, AT_29C010A, 128, 128, probe_jedec, erase_chip_jedec, write_jedec},
into flashchips.h and only one #define into flash.c? I don't exactly understand how to find device ID - looks like I need a small advice :)
2007/10/7, Peter Lemenkov lemenkov@gmail.com:
Hello All! After a quick look through the specs for At29C020 and At29C040A I realized that all these chips looks identical. The only difference is page size - 128 bytes at At29C010A and 256 bytes at 020 and 040 models.
So am I right then suggests that for enabling At20C010A chip I need only add few lines -
{"At29C010A", ATMEL_ID, AT_29C010A, 128, 128, probe_jedec, erase_chip_jedec, write_jedec},into flashchips.h and only one #define into flash.c? I don't exactly understand how to find device ID - looks like I need a small advice :)
Small note - I speak aboun flashrom.
On Sun, Oct 07, 2007 at 12:59:14AM +0400, Peter Lemenkov wrote:
After a quick look through the specs for At29C020 and At29C040A I realized that all these chips looks identical. The only difference is page size - 128 bytes at At29C010A and 256 bytes at 020 and 040 models.
Yes, that's pretty common for chips from the same family.
So am I right then suggests that for enabling At20C010A chip I need only add few lines -
{"At29C010A", ATMEL_ID, AT_29C010A, 128, 128, probe_jedec, erase_chip_jedec, write_jedec},into flashchips.h and only one #define into flash.c?
Yup.
I don't exactly understand how to find device ID - looks like I need a small advice :)
It should be mentioned in the chip data sheet. Look near the programming algorithm. Programming requires enabling a special command mode with some sequence of writes. Usually you can read the ID bytes instead of starting to program after that sequence.
//Peter
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Peter Lemenkov -
Peter Stuge