---------- Forwarded message ---------- From: "Николай Николаев" evrinoma@gmail.com Date: May 28, 2013 1:28 AM Subject: Re: [flashrom] Added chipsets To: "Steven Zakulec" spzakulec@gmail.com Cc:
Hi Steven,
Other people can provide more details on the general case, but in this
instance, with only a WREN instruction, the FEATURE line should be:
I've been informed by others that your original idea of dropping the
FEATURE line is actually correct, so you should do that instead of what I proposed.
i dropped this line because this line for chips fetch
Numonyx N25Q00AA13-
I'll admit I don't really know how this chip works, but it seems there should be a 3rd eraseblock from the description of the memory organization (datasheet is Rev E, 2/12):
Memory Configuration and Block Diagram The memory is a stacked device comprised of four 256Mb chips. Each chip is internally partitioned into two 128Mb segments. Each page of memory can be individually pro- grammed. Bits are programmed from one through zero. The device is subsector, sector, or single 256Mb chip erasable, but not page-erasable. Bits are erased from zero through one. The memory is configured as 134,217,728 bytes (8 bits each); 2048 sectors (64KB each); 32,768 subsectors (4KB each); and 524,288 pages (256 bytes each); and 64 OTP bytes are located outside the main memory array.
You've got:
.eraseblocks = { {4 * 1024, 32768 } },.block_erase = spi_block_erase_20,}, {.eraseblocks = { {64 * 1024, 2048 } },.block_erase = spi_block_erase_d8,There's a die erase opcode, which I am unfamiliar with- maybe it handles erasing a single 256Mb chip at a time?
You right this chip used a four 256 Mb chips. And 256 Mb chip has a three instruction subsector 20(hex) sector D8(hex) bulk C7(hex) erase commands. But chip N25Q00AA13 has a other op-code to initiate die erase command C4 (hex)
So, how do you do a single-chip erase for this chip?
I think this function is feature, because use "not general" op-code C4 for die erase command. Also first we need to write a special function feature extended addressing for chips more than 128 mb, after that we will think about how to initiate die erase instruction.
What data sheets do you have for those chips? The ones below list the
small sector erase op-code as D7. LE25FW418A: 61709 SY 20090428-S00004 No.A1432 LE25FW808: 61009 SY IM 20090319-S00003 No.A0839 LE25FW806: 70208 SY IM 20070628-S00004 No.A0838
I have a equivalence data sheets. LE25FW808 has a general op-code 20(hex) to initiate small sector erase. Other chips use a feature op-code as D7.
-
Steven Zakulec