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Date: Thu, 10 Nov 2005 12:44:53 +0100
From: Pavel Machek <pavel@ucw.cz>
To: David Woodhouse <dwmw2@infradead.org>
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Cc: linux-mtd@lists.infradead.org, kernel list <linux-kernel@vger.kernel.org>
Subject: Re: latest mtd changes broke collie
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Hi!

> > Well, how do I found out? I tried switching to CFI, and it will not
> > boot (unable to mount root...). No mtd-related messages as far as I
> > can see. There's quite a lot of mtd-related config options, I set them
> > like this:
> 
> If the old sharp driver had even a _chance_ of working, then you
> presumably have four 8-bit flash chips laid out on a 32-bit bus, and
> those chips are compatible with the Intel command set.
> 
> You can CONFIG_MTD_JEDECPROBE, and you want CONFIG_MTD_MAP_BANK_WIDTH=4,
> CONFIG_MTD_CFI_I4, CONFIG_MTD_CFI_INTELEXT.
> 
> Check that your chips are listed in the table in jedec_probe.c and turn
> on all the debugging in jedec_probe.c 

As far as I can see, they are not listed :-(.

static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd)
{
        map_word tmp, read0, read4;
        int width = 4;

        tmp = map_read(map, base+0);
        sharp_send_cmd(map, CMD_READ_ID, base+0);

        read0 = map_read(map, base+0);
        read4 = map_read(map, base+4);
        if (read0.x[0] == 0x00b000b0) {
                switch(read4.x[0]){
                case 0x00b000b0:
                        /* a6 - LH28F640BFHE 8 64k * 2 chip blocks*/
                        mtd->erasesize = 0x10000 * width / 2;
                        mtd->size = 0x800000 * width / 2;
                        return width;

...I've removed unneccessary code, this path is actually taken. Does
it mean that mfr == id == 0x00b0? [Notice that comment is wrong there,
probably belongs to another chip :-(]
							Pavel

-- 
Thanks, Sharp!