diff --git a/src/altera.cpp b/src/altera.cpp
index 52c91a38e..2cff2ad52 100644
--- a/src/altera.cpp
+++ b/src/altera.cpp
@@ -296,35 +296,13 @@ uint32_t Altera::idCode()
 #define MAX10_ISC_ENABLE        {0xcc, 0x02}
 #define MAX10_ISC_DISABLE       {0x01, 0x02}
 #define MAX10_ISC_ADDRESS_SHIFT {0x03, 0x02}
+#define MAX10_ISC_ERASE         {0xf2, 0x02}
 #define MAX10_ISC_PROGRAM       {0xf4, 0x02}
 #define MAX10_DSM_ICB_PROGRAM   {0xF4, 0x03}
 #define MAX10_DSM_VERIFY        {0x07, 0x03}
 #define MAX10_DSM_CLEAR         {0xf2, 0x03}
 #define MAX10_BYPASS            {0xFF, 0x03}
 
-typedef struct {
-	uint32_t check_addr0;  // something to check before sequence
-	uint32_t dsm_addr;
-	uint32_t dsm_len;  // 32bits
-	uint32_t ufm_addr;  // UFM1 addr
-	uint32_t ufm_len[2];
-	uint32_t cfm_addr;  // CFM2 addr
-	uint32_t cfm_len[3];
-	uint32_t done_bit_addr;
-	uint32_t pgm_success_addr;
-} max10_mem_t;
-
-static const std::map<uint32_t, max10_mem_t> max10_memory_map = {
-	{0x031820dd, {
-		0x80005,  // check_addr0
-		0x0000, 512,  // DSM
-		0x0200, {4096, 4096},  // UFM
-		0x2200, {35840, 14848, 20992},  // CFM
-		0x0009,  // done bit
-		0x000b}  // program success addr
-	},
-};
-
 void Altera::max10_program()
 {
 	POFParser _bit(_filename, _verbose);
@@ -402,7 +380,7 @@ void Altera::max10_program()
 	// Start!
 	max10_flow_enable();
 
-	max10_flow_erase();
+	max10_flow_erase(mem);
 	max10_dsm_verify();
 
 	/* Write */
@@ -464,16 +442,28 @@ static void word_to_array(uint32_t in, uint8_t *out) {
 	out[3] = (in >> 24) & 0xff;
 }
 
-void Altera::max10_flow_erase()
+void Altera::max10_flow_erase(const max10_mem_t &mem, const uint8_t erase_sectors)
 {
 	const uint32_t dsm_clear_delay = 350000120 / _clk_period;
 	const uint8_t dsm_clear[2] = MAX10_DSM_CLEAR;
+	const uint8_t isc_erase[2] = MAX10_ISC_ERASE;
 
-	max10_addr_shift(0x000000);
+	/* All sectors must be erased: DSM_CLEAR is better */
+	if (erase_sectors == 0x1f) {
+		max10_addr_shift(0x000000);
 
-	_jtag->shiftIR((unsigned char *)dsm_clear, NULL, IRLENGTH);
-	_jtag->set_state(Jtag::RUN_TEST_IDLE);
-	_jtag->toggleClk(dsm_clear_delay);
+		_jtag->shiftIR((unsigned char *)dsm_clear, NULL, IRLENGTH);
+		_jtag->set_state(Jtag::RUN_TEST_IDLE);
+		_jtag->toggleClk(dsm_clear_delay);
+	} else {
+		/* each bit is a sector to erase */
+		for (int sect = 0; sect < 5; sect++) {
+			if ((erase_sectors >> sect) & 0x01) {
+				max10_addr_shift(mem.sectors_erase_addr[sect]);
+				_jtag->shiftIR((unsigned char *)isc_erase, NULL, IRLENGTH);
+			}
+		}
+	}
 }
 
 void Altera::writeXFM(const uint8_t *cfg_data, uint32_t base_addr, uint32_t offset, uint32_t len)
diff --git a/src/altera.hpp b/src/altera.hpp
index 1491506f2..f85edf6d7 100644
--- a/src/altera.hpp
+++ b/src/altera.hpp
@@ -91,11 +91,36 @@ class Altera: public Device, SPIInterface {
 			CYCLONE10_FAMILY = 3,
 			STRATIXV_FAMILY  = 3,
 			CYCLONE_MISC     = 10, // Fixme: idcode shared
-			UNKNOWN_FAMILY = 999
+			UNKNOWN_FAMILY   = 999
 		};
 		/*************************/
 		/*     max10 specific    */
 		/*************************/
+		struct max10_mem_t {
+			uint32_t check_addr0;  // something to check before sequence
+			uint32_t dsm_addr;
+			uint32_t dsm_len;  // 32bits
+			uint32_t ufm_addr;  // UFM1 addr
+			uint32_t ufm_len[2];
+			uint32_t cfm_addr;  // CFM2 addr
+			uint32_t cfm_len[3];
+			uint32_t sectors_erase_addr[5]; // UFM1, UFM0, CFM2, CFM1, CFM0
+			uint32_t done_bit_addr;
+			uint32_t pgm_success_addr;
+		};
+
+		std::map<uint32_t, max10_mem_t> max10_memory_map = {
+			{0x031820dd, {
+				.check_addr0 = 0x80005,  // check_addr0
+				.dsm_addr = 0x0000, 512,  // DSM
+				.ufm_addr = 0x0200, .ufm_len = {4096, 4096},  // UFM
+				.cfm_addr = 0x2200, .cfm_len = {35840, 14848, 20992},  // CFM
+				.sectors_erase_addr = {0, 1, 2, 3, 4}, // sectors erase address
+				.done_bit_addr = 0x0009,  // done bit
+				.pgm_success_addr = 0x000b}  // program success addr
+			},
+		};
+
 		void max10_program();
 		void writeXFM(const uint8_t *cfg_data, uint32_t base_addr, uint32_t offset, uint32_t len);
 		uint32_t verifyxFM(const uint8_t *cfg_data, uint32_t base_addr, uint32_t offset,
@@ -105,7 +130,7 @@ class Altera: public Device, SPIInterface {
 		void max10_addr_shift(uint32_t addr);
 		void max10_flow_enable();
 		void max10_flow_disable();
-		void max10_flow_erase();
+		void max10_flow_erase(const max10_mem_t &mem, const uint8_t erase_sectors=0x1f);
 		void max10_dsm_program(const uint8_t *dsm_data, const uint32_t dsm_len);
 		bool max10_dsm_verify();
 		bool max10_dump();