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Interestingly enough, I was able to get linux bios from the chip, just not correctly. The starting address wasn't correct and I don't think I got the whole thing. I doubt intel will help, and I will alert you the second I have access to the storage that I think has the source code.
Joshua
ron minnich wrote:
On Wed, May 20, 2009 at 11:37 AM, Joshua McDowell jmcdowell@issisolutions.com wrote:
Maybe they can help, maybe not.
oh, the vendor *can* help. But will they help? In the past they have made it clear that it is not their policy to release this kind of info. You don't need info on the flash part; you need info on the mainboard itself.
The kind of info is found in the linux kernel in drivers/mtd/maps, in files like this: alchemy-flash.c ipaq-flash.c rbtx4939-flash.c amd76xrom.c ixp2000.c redwood.c autcpu12-nvram.c ixp4xx.c rpxlite.c bfin-async-flash.c Kconfig sa1100-flash.c cdb89712.c l440gx.c sbc8240.c ceiva.c Makefile sbc_gxx.c cfi_flagadm.c map_funcs.c sc520cdp.c ck804xrom.c mbx860.c scb2_flash.c dbox2-flash.c netsc520.c scx200_docflash.c dc21285.c nettel.c solutionengine.c dilnetpc.c octagon-5066.c sun_uflash.c dmv182.c omap_nor.c tqm8xxl.c edb7312.c pci.c ts5500_flash.c esb2rom.c pcmciamtd.c tsunami_flash.c fortunet.c physmap.c uclinux.c h720x-flash.c physmap_of.c vmax301.c ichxrom.c plat-ram.c vmu-flash.c impa7.c pmcmsp-flash.c wr_sbc82xx_flash.c integrator-flash.c pmcmsp-ramroot.c intel_vr_nor.c pxa2xx-flash.c
Let's look at one of interest, for example, the l440gx.c. In it you find code like this:
/* Set the iobase */ iobase = pm_iobase->start; pci_write_config_dword(pm_dev, 0x40, iobase | 1);
/* Set XBCS# */ pci_read_config_word(dev, 0x4e, &word); word |= 0x4; pci_write_config_word(dev, 0x4e, word);
/* Supply write voltage to the chip */ l440gx_set_vpp(&l440gx_map, 1);
/* Enable the gate on the WE line */ outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);
printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");
The key line follows the comment: /* Enable the gate on the WE line */
This is the kind of code that enables mainboard flash writes. A lot of the board support in mtd is old; vendors don't help much with this kind of information, as they are scared of the dreaded BIOS virus.
But this is what we need. I was hoping MTD had it; I don't know how LBFLASH fixed the WE problem, but if you can get us source we can try to see.
ron