HP C2502 SCSI card (NCR 53C400A based) not working

From: Ondrej Zary (linux_at_rainbow-software.org)
Date: 10/31/04

  • Next message: Sam Ravnborg: "Re: [PATCH 505] M68k: Update defconfig for 2.6.9" 
    Date:	Sun, 31 Oct 2004 13:22:03 +0100
To: ingmar@gonzo.schwaben.de

    Hello,
    I have an old ISA SCSI card that came with HP ScanJet IIP scanner. It's
    HP C2502 card based on NCR 53C400A chip. I was unable to get it working
    with g_NCR5380 driver so I tried loading the official MINI400I.SYS
    driver in DOSemu. I was surprised that the values sent to the ports are
    not the same as in the g_NCR5380 driver.

    The g_NCR5380 driver uses these "magic outbs" to configure the card
    (this sequence disables the card):
    outb(0x59, 0x779);
    outb(0xb9, 0x379);
    outb(0xc5, 0x379);
    outb(0xae, 0x379);
    outb(0xa6, 0x379);
    outb(0x00, 0x379);

    This is the output from DOSemu:
    779 < f
    379 < 22
    379 < f0
    379 < 20
    379 < 80
    379 < 00

    The magic numbers are different - so I have a card that is not supported
    by the driver. I've changed the numbers in the driver to match my card
    but I'm still unable to get it working.

    The g_NCR5380 driver uses this to check if the card is present at a
    particular base address:

    outb(0xc0, ports[i] + 9);
    if (inb(ports[i] + 9) != 0x80)
            continue;

    The MINI400I.SYS uses something different:
    (this is failed presence test at base address 0x280)
    28e < 25
    28f < a5
    28f > ff

    (this looks like a successful test at base address 0x350)
    35e < 25
    35f < a5
    35f > a5
    35f < 5a
    35f > 5a
    35e < 0
    35f < 0
    359 < 80
    359 < 10
    351 < 0
    352 < 0
    353 < 0
    354 < 0
    357 > ff
    359 < 80
    359 < 10
    351 < 0
    352 < 0
    353 < 0
    354 < 0
    357 > ff
    351 < 80
    351 < 0
    357 > ff

    According to this, I think that my card has the 53C400A chip registers
    mapped to different addresses (offsets) but I'm unable to determine what
    the mapping is. I was also unable to find the 53C400A data*** which
    might help a bit. 

    -- 
Ondrej Zary
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