diff --git a/flashchips.c b/flashchips.c
index e6c4b86..913e030 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -827,7 +827,7 @@
 		.total_size	= 64,
 		.page_size	= 128,
 		.tested		= TEST_OK_PRW,
-		.probe		= probe_jedec, 
+		.probe		= probe_jedec,
 		.probe_timing	= 10000, /* 10mS, Enter=Exec */
 		.erase		= NULL,
 		.block_erasers	=
@@ -1252,8 +1252,9 @@
 		.model_id	= AMIC_A49LF040A,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
-		.probe		= probe_49fl00x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* routine is wrapper to probe_jedec (pm49fl00x.c) */
 		.erase		= erase_49fl00x,
 		.write		= write_49fl00x,
@@ -2473,8 +2474,9 @@
 		.model_id	= PMC_49FL002,
 		.total_size	= 256,
 		.page_size	= 16 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
-		.probe		= probe_49fl00x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* routine is wrapper to probe_jedec (pm49fl00x.c) */
 		.erase		= erase_49fl00x,
 		.write		= write_49fl00x,
@@ -2489,8 +2491,9 @@
 		.model_id	= PMC_49FL004,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
-		.probe		= probe_49fl00x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_ZERO,	/* routine is wrapper to probe_jedec (pm49fl00x.c) */
 		.erase		= erase_49fl00x,
 		.write		= write_49fl00x,
@@ -2980,6 +2983,7 @@
 		.model_id	= SST_49LF002A,
 		.total_size	= 256,
 		.page_size	= 16 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
@@ -2996,6 +3000,7 @@
 		.model_id	= SST_49LF003A,
 		.total_size	= 384,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PR,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
@@ -3015,6 +3020,7 @@
 		.model_id	= SST_49LF004A,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
@@ -3060,6 +3066,7 @@
 		.model_id	= SST_49LF008A,
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
@@ -3156,6 +3163,7 @@
 		.model_id	= SST_49LF040B,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
@@ -3498,8 +3506,9 @@
 		.model_id	= ST_M50FLW040A,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_UNTESTED,
-		.probe		= probe_stm50flw0x0x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (stm50flw0x0x.c) */
 		.erase		= erase_stm50flw0x0x,
 		.write		= write_stm50flw0x0x,
@@ -3514,8 +3523,9 @@
 		.model_id	= ST_M50FLW040B,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_UNTESTED,
-		.probe		= probe_stm50flw0x0x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (stm50flw0x0x.c) */
 		.erase		= erase_stm50flw0x0x,
 		.write		= write_stm50flw0x0x,
@@ -3530,8 +3540,9 @@
 		.model_id	= ST_M50FLW080A,
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
-		.probe		= probe_stm50flw0x0x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (stm50flw0x0x.c) */
 		.erase		= erase_stm50flw0x0x,
 		.write		= write_stm50flw0x0x,
@@ -3546,8 +3557,9 @@
 		.model_id	= ST_M50FLW080B,
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_UNTESTED,
-		.probe		= probe_stm50flw0x0x,
+		.probe		= probe_jedec,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (stm50flw0x0x.c) */
 		.erase		= erase_stm50flw0x0x,
 		.write		= write_stm50flw0x0x,
@@ -4042,9 +4054,10 @@
 		.model_id	= W_39V080FA,
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_OK_PREW,
-		.probe		= probe_winbond_fwhub,
-		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (w39v080fa.c) */
+		.probe		= probe_jedec,
+		.probe_timing	= TIMING_FIXME,
 		.erase		= erase_winbond_fwhub,
 		.write		= write_winbond_fwhub,
 		.read		= read_memmapped,
@@ -4058,9 +4071,10 @@
 		.model_id	= W_39V080FA_DM,
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
+		.feature_bits	= FEATURE_REGISTERMAP,
 		.tested		= TEST_UNTESTED,
-		.probe		= probe_winbond_fwhub,
-		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (w39v080fa.c) */
+		.probe		= probe_jedec,
+		.probe_timing	= TIMING_FIXME,
 		.erase		= erase_winbond_fwhub,
 		.write		= write_winbond_fwhub,
 		.read		= read_memmapped,
diff --git a/jedec.c b/jedec.c
index e1bd12f..3a21539 100644
--- a/jedec.c
+++ b/jedec.c
@@ -189,13 +189,13 @@
 		printf_debug(", id2 is normal flash content");
 
 	printf_debug("\n");
-	if (largeid1 == flash->manufacture_id && largeid2 == flash->model_id)
-		return 1;
+	if (largeid1 != flash->manufacture_id || largeid2 != flash->model_id)
+		return 0;
 
 	if (flash->feature_bits & FEATURE_REGISTERMAP)
 		map_flash_registers(flash);
 
-	return 0;
+	return 1;
 }
 
 int erase_sector_jedec_common(struct flashchip *flash, unsigned int page,
diff --git a/pm49fl00x.c b/pm49fl00x.c
index 424b0ed..9d104e2 100644
--- a/pm49fl00x.c
+++ b/pm49fl00x.c
@@ -36,16 +36,6 @@
 	}
 }
 
-int probe_49fl00x(struct flashchip *flash)
-{
-	int ret = probe_jedec(flash);
-
-	if (ret == 1)
-		map_flash_registers(flash);
-
-	return ret;
-}
-
 int erase_49fl00x(struct flashchip *flash)
 {
 	int i;
diff --git a/sst_fwhub.c b/sst_fwhub.c
index 4a976e6..b29722f 100644
--- a/sst_fwhub.c
+++ b/sst_fwhub.c
@@ -89,8 +89,6 @@
 	if (probe_jedec(flash) == 0)
 		return 0;
 
-	map_flash_registers(flash);
-
 	for (i = 0; i < flash->total_size * 1024; i += flash->page_size)
 		check_sst_fwhub_block_lock(flash, i);
 
diff --git a/stm50flw0x0x.c b/stm50flw0x0x.c
index 0ae6eb8..e90bbd2 100644
--- a/stm50flw0x0x.c
+++ b/stm50flw0x0x.c
@@ -31,18 +31,6 @@
 #include "flash.h"
 #include "flashchips.h"
 
-int probe_stm50flw0x0x(struct flashchip *flash)
-{
-	int result = probe_jedec(flash);
-
-	if (!result)
-		return result;
-
-	map_flash_registers(flash);
-
-	return 1;
-}
-
 static void wait_stm50flw0x0x(chipaddr bios)
 {
 	chip_writeb(0x70, bios);
diff --git a/w39v080fa.c b/w39v080fa.c
index 311e55b..8e846dc 100644
--- a/w39v080fa.c
+++ b/w39v080fa.c
@@ -20,18 +20,6 @@
 
 #include "flash.h"
 
-int probe_winbond_fwhub(struct flashchip *flash)
-{
-	int result = probe_jedec(flash);
-
-	if (!result)
-		return result;
-
-	map_flash_registers(flash);
-
-	return 1;
-}
-
 static int unlock_block_winbond_fwhub(struct flashchip *flash, int offset)
 {
 	chipaddr wrprotect = flash->virtual_registers + offset + 2;