diff --git a/chipdrivers.h b/chipdrivers.h
index 6e2edc6..c5062ca 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -126,7 +126,8 @@
 
 /* sst28sf040.c */
 int probe_28sf040(struct flashchip *flash);
-int erase_28sf040(struct flashchip *flash);
+int erase_chip_28sf040(struct flashchip *flash, unsigned int addr, unsigned int blocklen);
+int erase_sector_28sf040(struct flashchip *flash, unsigned int address, unsigned int sector_size);
 int write_28sf040(struct flashchip *flash, uint8_t *buf);
 
 /* sst39sf020.c */
@@ -140,12 +141,16 @@
 /* sst49lfxxxc.c */
 int probe_49lfxxxc(struct flashchip *flash);
 int erase_49lfxxxc(struct flashchip *flash);
+int erase_sector_49lfxxxc(struct flashchip *flash, unsigned int address, unsigned int sector_size);
+int erase_block_49lfxxxc(struct flashchip *flash, unsigned int address, unsigned int sector_size);
+int erase_chip_49lfxxxc(struct flashchip *flash, unsigned int addr, unsigned int blocksize);
 int write_49lfxxxc(struct flashchip *flash, uint8_t *buf);
 
 /* sst_fwhub.c */
 int probe_sst_fwhub(struct flashchip *flash);
 int erase_sst_fwhub(struct flashchip *flash);
 int erase_sst_fwhub_block(struct flashchip *flash, unsigned int offset, unsigned int page_size);
+int erase_sst_fwhub_sector(struct flashchip *flash, unsigned int offset, unsigned int page_size);
 int write_sst_fwhub(struct flashchip *flash, uint8_t *buf);
 
 /* w39v040c.c */
diff --git a/flashchips.c b/flashchips.c
index 32c3514..70954b8 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -3480,7 +3480,7 @@
 				.eraseblocks = {
 					{1024 * 1024, 1}
 				},
-				.block_erase = NULL, /* 30 D0, only in PP mode */
+				.block_erase = NULL, /* 30 D0, only in A/A mux mode */
 			},
 		},
 		.write		= write_lhf00l04,
@@ -3754,7 +3754,17 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_28sf040,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst28sf040.c) */
-		.erase		= erase_28sf040,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {128, 4096} },
+				.block_erase = erase_sector_28sf040,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_28sf040,
+			}
+		},
 		.write		= write_28sf040,
 		.read		= read_memmapped,
 	},
@@ -3767,10 +3777,17 @@
 		.model_id	= SST_29EE010,
 		.total_size	= 128,
 		.page_size	= 128,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 10, 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -3786,7 +3803,14 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= 10, 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -3799,10 +3823,17 @@
 		.model_id	= SST_29EE020A,
 		.total_size	= 256,
 		.page_size	= 128,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 10,
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -3818,7 +3849,14 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= 10, 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_jedec,
 		.read		= read_memmapped,
 	},
@@ -3831,10 +3869,20 @@
 		.model_id	= SST_39SF010,
 		.total_size	= 128,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 32} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3847,10 +3895,20 @@
 		.model_id	= SST_39SF020,
 		.total_size	= 256,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3863,10 +3921,20 @@
 		.model_id	= SST_39SF040,
 		.total_size	= 512,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3879,10 +3947,20 @@
 		.model_id	= SST_39VF512,
 		.total_size	= 64,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns*/ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 16} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {64 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3895,10 +3973,20 @@
 		.model_id	= SST_39VF010,
 		.total_size	= 128,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 32} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {128 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3911,10 +3999,20 @@
 		.model_id	= SST_39VF020,
 		.total_size	= 256,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3930,7 +4028,17 @@
 		.tested		= TEST_OK_PROBE,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3946,7 +4054,20 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_chip_jedec,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 256} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {64 * 1024, 16} },
+				.block_erase = erase_block_jedec,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = erase_chip_block_jedec,
+			}
+		},
 		.write		= write_49f002,
 		.read		= read_memmapped,
 	},
@@ -3960,10 +4081,23 @@
 		.total_size	= 256,
 		.page_size	= 16 * 1024,
 		.feature_bits	= FEATURE_REGISTERMAP,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
-		.erase		= erase_sst_fwhub,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = erase_sst_fwhub_sector,
+			}, {
+				.eraseblocks = { {16 * 1024, 16} },
+				.block_erase = erase_sst_fwhub_block,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = NULL, /* AA 55 80 AA 55 10, only in A/A mux mode */
+			}
+		},
 		.write		= write_sst_fwhub,
 		.read		= read_memmapped,
 	},
@@ -3980,7 +4114,20 @@
 		.tested		= TEST_OK_PR,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
-		.erase		= erase_sst_fwhub,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 96} },
+				.block_erase = erase_sst_fwhub_sector,
+			}, {
+				.eraseblocks = { {64 * 1024, 6} },
+				.block_erase = erase_sst_fwhub_block,
+			}, {
+				.eraseblocks = { {384 * 1024, 1} },
+				.block_erase = NULL, /* AA 55 80 AA 55 10, only in A/A mux mode */
+			}
+		},
 		.write		= write_sst_fwhub,
 		.read		= read_memmapped,
 	},
@@ -4011,7 +4158,7 @@
 				.block_erase = erase_sst_fwhub_block, /* same as erase_block_jedec, but with unlock */
 			}, {
 				.eraseblocks = { {512 * 1024, 1} },
-				.block_erase = NULL, /* AA 55 80 AA 55 10, only in PP mode */
+				.block_erase = NULL, /* AA 55 80 AA 55 10, only in A/A mux mode */
 			},
 		},
 		.write		= write_sst_fwhub,
@@ -4029,7 +4176,22 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_49lfxxxc,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst49lfxxxc.c) */
-		.erase		= erase_49lfxxxc,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = erase_sector_49lfxxxc,
+			}, {
+				.eraseblocks = { 
+					{64 * 1024, 7},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_block_49lfxxxc,
+			}
+		},
 		.write		= write_49lfxxxc,
 		.read		= read_memmapped,
 	},
@@ -4043,10 +4205,23 @@
 		.total_size	= 1024,
 		.page_size	= 64 * 1024,
 		.feature_bits	= FEATURE_REGISTERMAP,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_sst_fwhub,
 		.probe_timing	= 1,		/* 150 ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
-		.erase		= erase_sst_fwhub,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 256} },
+				.block_erase = erase_sst_fwhub_sector,
+			}, {
+				.eraseblocks = { {64 * 1024, 16} },
+				.block_erase = erase_sst_fwhub_block,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = NULL, /* AA 55 80 AA 55 10, only in A/A mux mode */
+			}
+		},
 		.write		= write_sst_fwhub,
 		.read		= read_memmapped,
 	},
@@ -4062,7 +4237,22 @@
 		.tested		= TEST_UNTESTED,
 		.probe		= probe_49lfxxxc,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst49lfxxxc.c) */
-		.erase		= erase_49lfxxxc,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 256} },
+				.block_erase = erase_sector_49lfxxxc,
+			}, {
+				.eraseblocks = { 
+					{64 * 1024, 15},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_block_49lfxxxc,
+			}
+		},
 		.write		= write_49lfxxxc,
 		.read		= read_memmapped,
 	},
@@ -4075,10 +4265,25 @@
 		.model_id	= SST_49LF016C,
 		.total_size	= 2048,
 		.page_size	= 4 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_49lfxxxc,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst49lfxxxc.c) */
-		.erase		= erase_49lfxxxc,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 512} },
+				.block_erase = erase_sector_49lfxxxc,
+			}, {
+				.eraseblocks = { 
+					{64 * 1024, 31},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_block_49lfxxxc,
+			}
+		},
 		.write		= write_49lfxxxc,
 		.read		= read_memmapped,
 	},
@@ -4094,7 +4299,20 @@
 		.tested		= TEST_OK_PR,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_49lf040,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {16 * 1024, 16} },
+				.block_erase = erase_block_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = NULL,
+			}
+		},
 		.write		= write_49lf040,
 		.read		= read_memmapped,
 	},
@@ -4107,10 +4325,23 @@
 		.model_id	= SST_49LF020A,
 		.total_size	= 256,
 		.page_size	= 4 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_49lf040,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {16 * 1024, 16} },
+				.block_erase = erase_block_jedec,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = NULL,
+			}
+		},
 		.write		= write_49lf040,
 		.read		= read_memmapped,
 	},
@@ -4123,10 +4354,23 @@
 		.model_id	= SST_49LF040,
 		.total_size	= 512,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= 1,			/* 150 ns */ 
-		.erase		= erase_49lf040,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = erase_block_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = NULL,
+			}
+		},
 		.write		= write_49lf040,
 		.read		= read_memmapped,
 	},
@@ -4140,11 +4384,24 @@
 		.total_size	= 512,
 		.page_size	= 64 * 1024,
 		.feature_bits	= FEATURE_REGISTERMAP,
-		.tested		= TEST_OK_PREW,
-		.probe		= probe_sst_fwhub,
+		.tested		= TEST_UNTESTED,
+		.probe		= probe_jedec,
 		.probe_timing	= 1,		/* 150ns | routine is wrapper to probe_jedec (sst_fwhub.c) */
-		.erase		= erase_sst_fwhub,
-		.write		= write_sst_fwhub,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = erase_block_jedec,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = NULL,
+			}
+		},
+		.write		= write_49lf040,
 		.read		= read_memmapped,
 	},
 
@@ -4156,10 +4413,23 @@
  		.model_id	= SST_49LF080A,
 		.total_size	= 1024,
 		.page_size	= 4096,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_jedec,
 		.probe_timing	= TIMING_FIXME, 
-		.erase		= erase_49lf040,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 256} },
+				.block_erase = erase_sector_jedec,
+			}, {
+				.eraseblocks = { {64 * 1024, 16} },
+				.block_erase = erase_block_jedec,
+			}, {
+				.eraseblocks = { {1024 * 1024, 1} },
+				.block_erase = NULL,
+			}
+		},
 		.write		= write_49lf040,
 		.read		= read_memmapped,
 	},
@@ -4172,10 +4442,26 @@
 		.model_id	= SST_49LF160C,
 		.total_size	= 2048,
 		.page_size	= 4 * 1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PRW,
 		.probe		= probe_49lfxxxc,
 		.probe_timing	= TIMING_IGNORED, /* routine don't use probe_timing (sst49lfxxxc.c) */
 		.erase		= erase_49lfxxxc,
+		.erase		= NULL,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 512} },
+				.block_erase = erase_sector_49lfxxxc,
+			}, {
+				.eraseblocks = { 
+					{64 * 1024, 31},
+					{32 * 1024, 1},
+					{8 * 1024, 2},
+					{16 * 1024, 1},
+				},
+				.block_erase = erase_block_49lfxxxc,
+			}
+		},
 		.write		= write_49lfxxxc,
 		.read		= read_memmapped,
 	},
diff --git a/sst28sf040.c b/sst28sf040.c
index 930ad5b..f253e39 100644
--- a/sst28sf040.c
+++ b/sst28sf040.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2000 Silicon Integrated System Corporation
  * Copyright (C) 2005 coresystems GmbH <stepan@openbios.org>
+ * Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -50,7 +51,7 @@
 	chip_readb(bios + 0x041A);
 }
 
-static int erase_sector_28sf040(struct flashchip *flash, unsigned long address, int sector_size)
+int erase_sector_28sf040(struct flashchip *flash, unsigned int address, unsigned int sector_size)
 {
 	chipaddr bios = flash->virtual_memory;
 
@@ -67,7 +68,7 @@
 	return 0;
 }
 
-static int write_sector_28sf040(chipaddr bios, uint8_t *src, chipaddr dst,
+int write_sector_28sf040(chipaddr bios, uint8_t *src, chipaddr dst,
 				unsigned int page_size)
 {
 	int i;
@@ -162,3 +163,13 @@
 
 	return 0;
 }
+
+int erase_chip_28sf040(struct flashchip *flash, unsigned int addr, unsigned int blocklen)
+{
+	if ((addr != 0) || (blocklen != flash->total_size * 1024)) {
+		fprintf(stderr, "%s called with incorrect arguments\n",
+			__func__);
+		return -1;
+	}
+	return erase_28sf040(flash);
+}
diff --git a/sst49lfxxxc.c b/sst49lfxxxc.c
index a421acf..80e5520 100644
--- a/sst49lfxxxc.c
+++ b/sst49lfxxxc.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2000 Silicon Integrated System Corporation
  * Copyright (C) 2005-2007 coresystems GmbH
+ * Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -35,6 +36,15 @@
 #define	STATUS_ESS		(1 << 6)
 #define	STATUS_WSMS		(1 << 7)
 
+int unlock_block_49lfxxxc(struct flashchip *flash, unsigned long address, unsigned char bits)
+{
+	unsigned long lock = flash->virtual_registers + address + 2;
+	printf_debug("lockbits at address=0x%08lx is 0x%01x\n", lock, chip_readb(lock));
+	chip_writeb(bits, lock);
+
+	return 0;
+}
+
 static int write_lockbits_49lfxxxc(struct flashchip *flash, unsigned char bits)
 {
 	chipaddr registers = flash->virtual_registers;
@@ -72,7 +82,7 @@
 	return 0;
 }
 
-static int erase_sector_49lfxxxc(struct flashchip *flash, unsigned long address, int sector_size)
+int erase_sector_49lfxxxc(struct flashchip *flash, unsigned int address, unsigned int sector_size)
 {
 	unsigned char status;
 	chipaddr bios = flash->virtual_memory;
@@ -97,6 +107,31 @@
 	return 0;
 }
 
+int erase_block_49lfxxxc(struct flashchip *flash, unsigned int address, unsigned int block_size)
+{
+	unsigned char status;
+	chipaddr bios = flash->virtual_memory;
+
+	chip_writeb(BLOCK_ERASE, bios);
+	chip_writeb(ERASE, bios + address);
+
+	do {
+		status = chip_readb(bios);
+		if (status & (STATUS_ESS | STATUS_BPS)) {
+			printf("block erase FAILED at address=0x%08lx status=0x%01x\n", bios + address, status);
+			chip_writeb(CLEAR_STATUS, bios);
+			return (-1);
+		}
+	} while (!(status & STATUS_WSMS));
+	chip_writeb(RESET, bios);
+
+	if (check_erased_range(flash, address, block_size)) {
+		fprintf(stderr, "ERASE FAILED!\n");
+		return -1;
+	}
+	return 0;
+}
+
 static int write_sector_49lfxxxc(chipaddr bios, uint8_t *src, chipaddr dst,
 				 unsigned int page_size)
 {
diff --git a/sst_fwhub.c b/sst_fwhub.c
index b29722f..75d9e05 100644
--- a/sst_fwhub.c
+++ b/sst_fwhub.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2000 Silicon Integrated System Corporation
  * Copyright (C) 2009 Kontron Modular Computers
+ * Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -114,6 +115,25 @@
 	return 0;
 }
 
+int erase_sst_fwhub_sector(struct flashchip *flash, unsigned int offset, unsigned int page_size)
+{
+	uint8_t blockstatus = clear_sst_fwhub_block_lock(flash, offset);
+
+	if (blockstatus) {
+		printf("Sector lock clearing failed, not erasing sector "
+			"at 0x%06x\n", offset);
+		return 1;
+	}
+
+	if (erase_sector_jedec(flash, offset, page_size)) {
+		fprintf(stderr, "ERASE FAILED!\n");
+		return -1;
+	}
+	toggle_ready_jedec(flash->virtual_memory);
+
+	return 0;
+}
+
 int erase_sst_fwhub(struct flashchip *flash)
 {
 	int i;