From: Dan White <dan@whiteaudio.com>
Date: Wed, 8 May 2013 18:55:48 +0000 (-0500)
Subject: bootloader: reduce delay time for flash chip wakeup
X-Git-Tag: rcf-ini-submit~6
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=59655858be35a86656c9895f020d56da93f7ab9a;p=430.git

bootloader: reduce delay time for flash chip wakeup

Delay is sufficient for up to a 100 MHz clock.
---

diff --git a/msp4th/flashboot.s b/msp4th/flashboot.s
index 7270dc1..94cce9f 100644
--- a/msp4th/flashboot.s
+++ b/msp4th/flashboot.s
@@ -102,7 +102,9 @@
     mov     #0x00f0,&SPI0_CR
 
 ;delay for a bit, the flash needs minimum 30us to arrive in active/idle mode
-    mov     #0xffff,   r5
+; this delay count is roughly 30us for a MCLK of 100 MHz and thence plenty
+; sufficient for any slower clock
+    mov     #1500,  r5
 2:
     dec     r5
     jnz     2b
@@ -112,20 +114,8 @@
     mov     #0,     &CRCINIRES
 
 
-/*
-;check state of PA.9 (aka I2C SCL)
-;r13 holds the flag
-; PA.9 low -> do not byteswap
-; PA.9 high -> byteswap words from flash
-    clr     r13             
-    bit     #0x0200,&PADSR
-    jz      3f
-    mov     #1,     r13
-3:
-*/
-
 ;r7 holds start of RAM address
-;r8 (end of RAM)+1
+;r8 (last address of RAM)+1
 .ifdef BOOTROM
     mov     #RAMStart,r7
     mova    #(RAMStart+RAMSize),r8