From: notaz <notasas@gmail.com>
Date: Mon, 7 Sep 2020 12:30:27 +0000 (+0300)
Subject: support erase on a cart with a mapper or through a mirror
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=flashkit-mdc.git;a=commitdiff_plain;h=f34ac796daecb84b7228c4eb6aa971039cb4dba8

support erase on a cart with a mapper or through a mirror
---

diff --git a/flashkit.c b/flashkit.c
index 1dc54d9..9884dd6 100644
--- a/flashkit.c
+++ b/flashkit.c
@@ -406,17 +406,23 @@ static void read_info(int fd)
 
 static uint32_t get_block_addr(uint32_t addr, uint32_t blk_offset)
 {
-	uint32_t i;
+	uint32_t i, base, faddr;
 
 	assert(info.region_cnt);
+	assert(info.size);
+
+	// get a flash address to allow mapper hardware
+	faddr = addr & (info.size - 1);
+	base = addr & ~(info.size - 1);
+
 	for (i = 0; i < info.region_cnt; i++) {
-		if (info.region[i].start <= addr
-		    && addr < info.region[i].start + info.region[i].size)
+		if (info.region[i].start <= faddr
+		    && faddr < info.region[i].start + info.region[i].size)
 		{
-			uint32_t blk = (addr - info.region[i].start)
+			uint32_t blk = (faddr - info.region[i].start)
 					/ info.region[i].block_size
 					+ blk_offset;
-			return info.region[i].start
+			return base + info.region[i].start
 				+ blk * info.region[i].block_size;
 		}
 	}