[U-Boot-Users] Patch to boot systemace read performance

20 Mar 2004

This small patch increases file read performance from CompactFLASH
via SystemACE. It makes a significant difference.
CHANGELOG ENTRY
* Patch by Stephen Williams, 19 March 2004
   Increase speed of sector reads from SystemACE,
   shorten poll timeout and remove a useless reset.
-- 
Steve Williams                "The woods are lovely, dark and deep.
steve at XXXXXXXXXX           But I have promises to keep,
http://www.XXXXXXXXXX         and lines to code before I sleep,
http://www.picturel.com       And lines to code before I sleep."

Index: common/cmd_ace.c
===================================================================
RCS file: /cvsroot/u-boot/u-boot/common/cmd_ace.c,v
retrieving revision 1.3
diff -u -r1.3 cmd_ace.c

--- common/cmd_ace.c	27 Feb 2004 08:21:54 -0000	1.3
+++ common/cmd_ace.c	20 Mar 2004 02:36:20 -0000
@@ -190,16 +190,13 @@
          /* Write sector count | ReadMemCardData. */
        ace_writew((trans&0xff) | 0x0300, 0x14);

-	      /* CONTROLREG = CFGRESET|LOCKREQ */
-	    ace_writew(0x0082, 0x18);
-
        retry = trans * 16;
        while (retry > 0) {
    	  int idx;

    	    /* Wait for buffer to become ready. */
    	  while (! (ace_readw(0x04) & 0x0020)) {
-			udelay(1000);
+			udelay(100);
    	  }

    	    /* Read 16 words of 2bytes from the sector buffer. */

    

Stephen Williams

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