Hi Agostino
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Datum: Wed, 14 Oct 2009 13:11:17 +0200 Von: Stefan Roese sr@denx.de An: u-boot@lists.denx.de CC: Niklaus Giger niklaus.giger@netstal.com, SETTE AGOSTINO - technolabs Agostino.Sette@technolabs.it Betreff: Re: [U-Boot] Question on EON EN29LV160B Flash Memory
On Wednesday 14 October 2009 11:20:21 SETTE AGOSTINO - technolabs wrote:
I am going to prepare a new U-Boot with a HW which has on board an EON EN29LV160B Flash Memory. As far as I see in the latest U-Boot tree this kind of FLASH is not yet managed but anyhow I found some infos on EON manufacturer into the file u-boot/include/flash.h and more exactly
173 /* Manufacturers inside bank 1 have ids like 0x01xx01xx */ 174 #define EON_MANUFACT 0x011C011C /* EON manuf. ID in D23..D16, D7..D0 */
I have an EON EN29LV160B Flash Memory datasheet and on the Manufacturer
ID
I have different infos which indicate differente values, as here
reported
173 /* Manufacturers inside bank 1 have ids like 0x7Fxx7Fxx */ 174 #define EON_MANUFACT 0x7F1C7F1C /* EON manuf. ID in D23..D16, D7..D0 */
Is this correct?
Yes, this looks correct on first glance. But I'm not really sure. I added Niklaus Giger to Cc, who introduced this define.
Niklaus, could you please comment here? Thanks.
See www.jedec.org/download/search/jep106Z.pdf.
I would like to cite the "JEDEC Standard Manufacturer ID Codes.pdf" chapter "2 Scope":
The manufacturer’s identification code is defined by one or more eight (8) bit fields, each consisting of seven (7) data bits plus one (1) odd parity bit. The manufacturer’s identification code as shown in Table 1, is assigned, maintained and updated by the JEDEC office. It is a single field, limiting the possible number of vendors to 128. To expand the maximum number of identification codes, a continuation scheme has been defined. The code 7F, as shown in Table 1, indicates that the manufacturer’s code is beyond the limit of this field and the next sequential manufacturer’s identification field is used. Multiple continuation fields are permitted and when used, shall comprise of the identification code.
At the momemnt we defined 6 additional table, but potentially there could be even more. Where there is place for 16 bit values. - ID's of the the table 1 (0xXX) get IDs of 0x00xx. - ID's of the the table 2 (0xXX) get IDs of 0x01xx. - ID's of the the table 3 (0xXX) get IDs of 0x02xx. - ID's of the the table 4 (0xXX) get IDs of 0x03xx. Using the data in the above mentioned PDF and following this rule the manufacturer "Jennic" would receive ID 0x0686.
The proposed value of #define EON_MANUFACT 0x7F1C7F1C does not fit into 16 bits.
And don't forget to follow Stefan's remark about using JEDEC- lecagy. Then you should not have any problems.
Best regards
Niklaus
Furthermore, if I would like to add this kind of flash I have to modify, add the flash type/config, the file
u-boot/drivers/mtd/jedec_flash.c
or
u-boot/drivers/mtd/cfi_flash.c
Changes in jedec_flash.c should be sufficient. Even though you need to enable the CFI driver (CONFIG_FLASH_CFI_DRIVER) and this JEDEC legacy driver (CONFIG_FLASH_CFI_LEGACY).
Cheers, Stefan
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