Re: Re: [linux-sh:03360] About Compact Flash Memory Mapped

Another question:
if you read into ide.c of blob-2.0.5-pre3 you can find a function called 
hd_busy_wait.
In such a function I can read the using of port of type PORT* (u32 pointer) 
and a cast of port[1] to u8 for accessing to error register, but if I have 
PORT *port, port0] is u32 so that &port[1] is &port[0] + 4. I'm a little 
confused. I attach the piece of code:

hd_busy_wait(volatile PORT *port)
{
    int count;
    u8 status, err;

    count = 0;
    while (count++ < 1500) {
        status = (u8)port[7];
        if ((status & BUSY) == 0)
            break;
        udelay();
    }

#if 0
    SerialOutputString("busy_wait: count ");
    SerialOutputHex(count);
    SerialOutputString("\n");
    SerialOutputString("status ");
    SerialOutputHex(status);
    SerialOutputString("\n");
#endif

    if (status & 0x01) {
        err = (u8)port[1];
        SerialOutputString("err reg ");
        SerialOutputHex(err);
        SerialOutputString("\n");
        return -1;
    }

    return 0;
}

On Friday 22 October 2004 12:08, mt wrote:
> Check out Marc Singer's Linux port/patch for Logic's
> Sharp A400; the A400 Card Engine has the same
> word-access setup as the 7760 Card Engine.  A
> quote from Marc's webpage:
>
> "Compact Flash (IDE) driver with polling. It
>  can now be used to host a root filesystem."
> ( http://projects.buici.com/arm/lpd7a40x )
>
>
> Also, Logic has a Linux port available for
> the Sharp 79520 Card Engine, which also has
> the same CF setup; though I'd recommend looking
> at Marc's work first.
>
>
> Regards
>
> --- Fabio Giovagnini <[email protected]> wrote:
> > Hi All, Hi Paul
> > I'm writing to understand what I'm in front of.
> > On my Logic PD 7760 based board, I want to enable the boot
> > from CF. The HW
> > manula of the card tells me the CF is connected only in Memory
> > Mapped Mode. I
> > got the eclectical schematic of CF connector connection and I
> > read A0 pin si
> > grounded.This means I can read and write only WORD, and I
> > cannot access the
> > single byte. Now, when I write the Drive/Head (offset 6)
> > register, I write
> > also Command register. Is it possible to execute a command
> > writing together
> > Drive / Head and commad task registers?
> >
> > Thanks a lot
> >
> > Fabio
>
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