Hi Agostino
-------- Original-Nachricht -------- > Datum: Wed, 14 Oct 2009 13:11:17 +0200 > Von: Stefan Roese <s...@denx.de> > An: u-boot@lists.denx.de > CC: Niklaus Giger <niklaus.gi...@netstal.com>, SETTE AGOSTINO - technolabs > <agostino.se...@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 > > -- > DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel > HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany > Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off...@denx.de > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot -- Niklaus Giger Switzerland Jetzt kostenlos herunterladen: Internet Explorer 8 und Mozilla Firefox 3.5 - sicherer, schneller und einfacher! http://portal.gmx.net/de/go/atbrowser _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
