From 3c84f7328f2485d65fb6ebb925bf9eae4fa81ae5 Mon Sep 17 00:00:00 2001
From: Stefan Rueger <stefan.rueger@urclocks.com>
Date: Tue, 13 Jun 2023 18:19:31 +0100
Subject: [PATCH] Invalidate cache in stk500v2_paged_write()

Bytewise access uses a cache, but paged access doesn't so must invalidate
the cache when writing a page - otherwise mixing bytewise and paged access
is bound to fail.
---
 src/stk500v2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/stk500v2.c b/src/stk500v2.c
index 73576c0e..a95af29c 100644
--- a/src/stk500v2.c
+++ b/src/stk500v2.c
@@ -2724,6 +2724,7 @@ static int stk500v2_paged_write(const PROGRAMMER *pgm, const AVRPART *p, const A
   // determine which command is to be used
   if (strcmp(m->desc, "flash") == 0) {
     addrshift = 1;
+    PDATA(pgm)->flash_pageaddr = -1UL; // Invalidate cache
     commandbuf[0] = CMD_PROGRAM_FLASH_ISP;
     /*
      * If bit 31 is set, this indicates that the following read/write
@@ -2735,6 +2736,7 @@ static int stk500v2_paged_write(const PROGRAMMER *pgm, const AVRPART *p, const A
       use_ext_addr = (1U << 31);
     }
   } else if (strcmp(m->desc, "eeprom") == 0) {
+    PDATA(pgm)->eeprom_pageaddr = -1UL; // Invalidate cache
     commandbuf[0] = CMD_PROGRAM_EEPROM_ISP;
   }
   commandbuf[4] = m->delay;