linux-kernel - [PATCH 2/4] Add udelay to A100U2W SCSI driver

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Date:	Tue, 15 Jul 2008 10:12:13 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	torvalds@...ux-foundation.org
cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] Add udelay to A100U2W SCSI driver

udelay is required on Sun Ultra 5.
I don't know any reason or explanation for this, it was found purely
experimentally.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
---
  drivers/scsi/a100u2w.c |    1 +
  1 file changed, 1 insertion(+)

Index: linux-2.6.26-rc8/drivers/scsi/a100u2w.c
===================================================================
--- linux-2.6.26-rc8.orig/drivers/scsi/a100u2w.c	2008-07-01 18:48:09.000000000 +0200
+++ linux-2.6.26-rc8/drivers/scsi/a100u2w.c	2008-07-01 18:48:11.000000000 +0200
@@ -401,6 +401,7 @@ static u8 orc_load_firmware(struct orc_h

  	/* Copy the code from the BIOS to the SRAM */

+	udelay(500);	/* Required on Sun Ultra 5 ... 350 -> failures */
  	bios_addr = (u16) le32_to_cpu(data32);	/* FW code locate at BIOS address + ? */
  	for (i = 0, data32_ptr = (u8 *) & data32;	/* Download the code    */
  	     i < 0x1000;	/* Firmware code size = 4K      */
--
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