From: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>
Date: Sun, 31 Mar 2013 20:54:02 +0000 (+0200)
Subject: Workaround "eicall" compiler bug
X-Git-Tag: v0.96~4
X-Git-Url: http://git.linex4red.de/pub/USBaspLoader.git/commitdiff_plain/6c347ffa2ceef6cd7a9009d4c544e788d31a24e8?hp=e59306aabda9c2b64ef68f8b4bdee9f5710912c1

Workaround "eicall" compiler bug

There seems to be another funny compiler Bug.
When gcc is using "eicall" opcode it forgets to modify EIND.
On devices with large flash memory there are some target address bits
missing.

Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>
---

diff --git a/firmware/main.c b/firmware/main.c
index feb5eff..07300b9 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -260,7 +260,16 @@ asm  volatile  (
     USB_INTR_CFG = 0;       /* also reset config bits */
     GICR = (1 << IVCE);     /* enable change of interrupt vectors */
     GICR = (0 << IVSEL);    /* move interrupts to application flash section */
-    
+
+/*
+ * There seems to be another funny compiler Bug.
+ * When gcc is using "eicall" opcode it forgets to modify EIND.
+ * On devices with large flash memory there are some target address bits
+ * missing. In this case some zero bits...
+ */
+#if (defined(EIND) && ((FLASHEND)>131071))
+  EIND=0;
+#endif
 /* We must go through a global function pointer variable instead of writing
  *  ((void (*)(void))0)();
  * because the compiler optimizes a constant 0 to "rcall 0" which is not