[U-Boot-Users] TRAB: Flash Am29LV320DB confusion

[U-Boot-Users] TRAB: Flash Am29LV320DB confusion

[triloksoni]

Hi All,

I was just going through the "flash.c" code of TRAB board. Which is having
AM29LV320D (2M x 16bit)  flash chip. We are also going to use the same chip
for our new board in 16bit mode.

Confusion is in flash_init(...) code. As per the sector architecture 
mentioned in
the datasheet : Eight 8 Kbytes sector and Sixty Three 64Kbytes sectors. 
Then why this code has
mentioned remaining sector size as 128Kbytes :

board/trab/flash.c:
--------------snip-------------------------
                        switch (info->flash_id & FLASH_TYPEMASK) {
                        case (FLASH_AM320B & FLASH_TYPEMASK):
                        case (FLASH_MXLV320B & FLASH_TYPEMASK):
                                /* Boot sector type: 8 x 8 + N x 128 kB */
                               /* Why N x 128 kB?? It should be N x 64 
kB. */
                                flashbase += (j < 8) ? 0x4000 : 0x20000;
                                break;
--------------snip-------------------------

Am I missing something ???

---Trilok Soni

[U-Boot-Users] TRAB: Flash Am29LV320DB confusion

[Wolfgang Denk]

Dear Trilok,

in message <41F626C8.5070906@emuzed.com> you wrote:
> 
> the datasheet : Eight 8 Kbytes sector and Sixty Three 64Kbytes sectors. 
> Then why this code has
> mentioned remaining sector size as 128Kbytes :

There are 2 flash chips in parallel to have a 2 x 16 =  32  bit  wide
bus, and 2 x 64 KiB = 128 KiB.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Roses are red
Violets are blue
Some poems rhyme

[U-Boot-Users] TRAB: Flash Am29LV320DB confusion

[Peter Asemann]

Btw.: Will an AM29LV320D work with the cfi_flash generic driver? Does 
anybody know that?

Best regards,

Peter Asemann

[U-Boot-Users] TRAB: Flash Am29LV320DB confusion

[Wolfgang Denk]

In message <41F79FC0.9000901@web.de> you wrote:
> Btw.: Will an AM29LV320D work with the cfi_flash generic driver? Does 
> anybody know that?

Yes. Yes.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
There are some things worth dying for.
	-- Kirk, "Errand of Mercy", stardate 3201.7

[U-Boot-Users] TRAB: Flash Am29LV320DB confusion

[Bharath]

Hi Trilok,

>the datasheet : Eight 8 Kbytes sector and Sixty Three 64Kbytes sectors. 
>Then why this code hasmentioned remaining sector size as 128Kbytes :

	I guess he is using 2 Flash Devices on his board, 2 * 16bit devices
,so he would have a total sector size of one chip * 2,

Hope this helps,

Cheers,

.Bharath.

PS : I havent used this device or neither have i read its datasheet, this is
just my interpretation from the flash functions.



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