mpm: Add EEPROM utilities for N310

Actually-written-by: Moritz Fischer <moritz.fischer@ettus.com>

12 files changed, 960 insertions, 4 deletions

diff --git a/mpm/tools/CMakeLists.txt b/mpm/tools/CMakeLists.txt
index 75cda4853..727635a02 100644
--- a/mpm/tools/CMakeLists.txt
+++ b/mpm/tools/CMakeLists.txt
@@ -1,10 +1,37 @@
 #
-# Copyright 2017 Ettus Research, National Instruments Company
+# Copyright 2017 Ettus Research, a National Instruments Company
 #
 # SPDX-License-Identifier: GPL-3.0
 #
 
 INSTALL(PROGRAMS
-  mpm_shell.py
-  mpm_debug.py
-  DESTINATION ${RUNTIME_DIR})
+    mpm_shell.py
+    mpm_debug.py
+    DESTINATION ${RUNTIME_DIR}
+)
+
+SET(eeprom_tool_sources)
+SET(eeprom_tool_libs)
+
+IF("${MPM_DEVICE}" STREQUAL "n310")
+    MESSAGE(STATUS "Adding N310-specific EEPROM tools...")
+    SET(eeprom_tool_libs eeprom.c)
+    SET(eeprom_tool_sources
+        db-dump.c
+        db-id.c
+        db-init.c
+        eeprom-blank.c
+        eeprom-dump.c
+        eeprom-id.c
+        eeprom-init.c
+        eeprom-set-flags.c
+        fan-limits.c
+    )
+ENDIF("${MPM_DEVICE}" STREQUAL "n310")
+
+#for each source: build an executable and install
+FOREACH(eeprom_tool_source ${eeprom_tool_sources})
+    GET_FILENAME_COMPONENT(eeprom_tool ${eeprom_tool_source} NAME_WE)
+    ADD_EXECUTABLE(${eeprom_tool} ${eeprom_tool_source} ${eeprom_tool_libs})
+    INSTALL(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${eeprom_tool} DESTINATION ${RUNTIME_DIR})
+ENDFOREACH(eeprom_tool_source ${eeprom_tool_sources})
diff --git a/mpm/tools/db-dump.c b/mpm/tools/db-dump.c
new file mode 100644
index 000000000..f4190a2aa
--- /dev/null
+++ b/mpm/tools/db-dump.c
@@ -0,0 +1,31 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_db_eeprom *ep;
+	int which_slot = 0;
+
+	if (argc != 2)
+		return EXIT_FAILURE;
+
+	which_slot = atoi(argv[1]);
+
+	if (!which_slot)
+		ep = usrp_sulfur_db_eeprom_from_file(NVMEM_PATH_SLOT_A);
+	else
+		ep = usrp_sulfur_db_eeprom_from_file(NVMEM_PATH_SLOT_B);
+
+	if (!ep)
+		return EXIT_FAILURE;
+	usrp_sulfur_db_eeprom_print(ep);
+	free(ep);
+
+	return 0;
+}
diff --git a/mpm/tools/db-id.c b/mpm/tools/db-id.c
new file mode 100644
index 000000000..140f50914
--- /dev/null
+++ b/mpm/tools/db-id.c
@@ -0,0 +1,43 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "eeprom.h"
+
+static void usrp_sulfur_db_eeprom_print_id(struct usrp_sulfur_db_eeprom *ep)
+{
+	if (ntohs(ep->pid) == 0x150)
+		printf("product=ni,magnesium-rev%x\n", ntohs(ep->rev)+1);
+	else if (ntohs(ep->pid) == 0x180)
+		printf("product=ni,eiscat-rev%x\n", ntohs(ep->rev)+1);
+	else
+		printf("product=unknown-(%04x)\n", ep->pid);
+
+	printf("serial=%s\n", ep->serial);
+}
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_db_eeprom *ep;
+
+	ep = usrp_sulfur_db_eeprom_from_file(NVMEM_PATH_SLOT_A);
+	if (ep) {
+		printf("Slot-0\n");
+		usrp_sulfur_db_eeprom_print_id(ep);
+		free(ep);
+	}
+
+	ep = usrp_sulfur_db_eeprom_from_file(NVMEM_PATH_SLOT_B);
+	if (ep) {
+		printf("Slot-0\n");
+		usrp_sulfur_db_eeprom_print_id(ep);
+		free(ep);
+	}
+
+	return EXIT_SUCCESS;
+}
+
diff --git a/mpm/tools/db-init.c b/mpm/tools/db-init.c
new file mode 100644
index 000000000..c0e7ba464
--- /dev/null
+++ b/mpm/tools/db-init.c
@@ -0,0 +1,44 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+void usage(char *argv[])
+{
+	printf("-- Usage -- \n");
+	printf("%s slot pid rev serial#\n\n", argv[0]);
+	printf("Example:\n");
+	printf("$ %s 0 0x0150 0 310A850\n",
+		argv[0]);
+
+}
+
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_db_eeprom *ep;
+	int which_slot = 0;
+
+	if (argc != 5) {
+		usage(argv);
+		return EXIT_FAILURE;
+	}
+
+	which_slot = atoi(argv[1]);
+
+	ep = usrp_sulfur_db_eeprom_new(strtol(argv[2], NULL, 16), atoi(argv[3]), argv[4]);
+	usrp_sulfur_db_eeprom_print(ep);
+
+	if (!which_slot)
+		usrp_sulfur_db_eeprom_to_file(ep, NVMEM_PATH_SLOT_A);
+	else
+		usrp_sulfur_db_eeprom_to_file(ep, NVMEM_PATH_SLOT_B);
+
+	return 0;
+}
+
diff --git a/mpm/tools/eeprom-blank.c b/mpm/tools/eeprom-blank.c
new file mode 100644
index 000000000..d8314a382
--- /dev/null
+++ b/mpm/tools/eeprom-blank.c
@@ -0,0 +1,45 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void usage(char *argv[])
+{
+	printf("-- Usage -- \n");
+	printf("Example:\n");
+	printf("%s -c -f\n", argv[0]);
+}
+
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_eeprom *ep;
+	int erase = 0;
+
+	if (argc == 3) {
+		erase = !strcmp("-c", argv[1]) &&
+			!strcmp("-f", argv[2]);
+	} else {
+		usage(argv);
+		return EXIT_FAILURE;
+	}
+
+	if (!erase)
+		return EXIT_FAILURE;
+
+	printf("Erasing ...");
+	ep = malloc(sizeof(*ep));
+	memset(ep, 0xff, sizeof(*ep));
+
+	usrp_sulfur_eeprom_to_i2c(ep, "/dev/i2c-2");
+	printf(" Done\n");
+	free(ep);
+
+	return EXIT_SUCCESS;
+}
diff --git a/mpm/tools/eeprom-dump.c b/mpm/tools/eeprom-dump.c
new file mode 100644
index 000000000..08c2c4208
--- /dev/null
+++ b/mpm/tools/eeprom-dump.c
@@ -0,0 +1,21 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_eeprom *ep;
+
+	ep = usrp_sulfur_eeprom_from_file(NVMEM_PATH_MB);
+	if (!ep)
+		return EXIT_FAILURE;
+	usrp_sulfur_eeprom_print(ep);
+	free(ep);
+
+	return 0;
+}
diff --git a/mpm/tools/eeprom-id.c b/mpm/tools/eeprom-id.c
new file mode 100644
index 000000000..f19a17ca1
--- /dev/null
+++ b/mpm/tools/eeprom-id.c
@@ -0,0 +1,32 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "eeprom.h"
+
+static void usrp_sulfur_eeprom_print_id(struct usrp_sulfur_eeprom *ep)
+{
+	if (ep->pid == 0x4242)
+		printf("product=ni,n310-rev%x\n", ntohs(ep->rev)+1);
+	else
+		printf("product=unknown-(%04x)\n", ntohs(ep->pid));
+
+	printf("serial=%s\n", ep->serial);
+}
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_eeprom *ep;
+
+	ep = usrp_sulfur_eeprom_from_file(NVMEM_PATH_MB);
+	if (!ep)
+		return EXIT_FAILURE;
+
+	usrp_sulfur_eeprom_print_id(ep);
+
+	free(ep);
+}
diff --git a/mpm/tools/eeprom-init.c b/mpm/tools/eeprom-init.c
new file mode 100644
index 000000000..a7eeeab70
--- /dev/null
+++ b/mpm/tools/eeprom-init.c
@@ -0,0 +1,42 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+void usage(char *argv[])
+{
+	printf("-- Usage -- \n");
+	printf("%s serial# revision eth0 eth1 eth2\n\n", argv[0]);
+	printf("Example:\n");
+	printf("$ %s 310A850 2 0c:22:cc:1a:25:c1 0c:22:cc:1a:25:c2 0c:22:cc:1a:25:c3\n",
+		argv[0]);
+
+}
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_eeprom *ep, *ep2;
+
+	if (argc != 6) {
+		usage(argv);
+		return EXIT_FAILURE;
+	}
+
+	printf("sizeof(*ep)=%lu\n", sizeof(*ep));
+
+	ep = usrp_sulfur_eeprom_new(NULL, 0x4242, atoi(argv[2]), argv[1], argv[3],
+	                            argv[4],  argv[5]);
+	usrp_sulfur_eeprom_print(ep);
+	usrp_sulfur_eeprom_to_i2c(ep, "/dev/i2c-2");
+	free(ep);
+
+	printf("-- Reading back \n");
+	ep2 = usrp_sulfur_eeprom_from_file(NVMEM_PATH_MB);
+	usrp_sulfur_eeprom_print(ep2);
+	free(ep2);
+}
diff --git a/mpm/tools/eeprom-set-flags.c b/mpm/tools/eeprom-set-flags.c
new file mode 100644
index 000000000..00a96677e
--- /dev/null
+++ b/mpm/tools/eeprom-set-flags.c
@@ -0,0 +1,58 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+void usage(char *argv[])
+{
+	printf("-- Usage -- \n");
+	printf("%s flags\n", argv[0]);
+	printf("Example:\n");
+	printf("$ %s 0x1\n", argv[0]);
+
+}
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_eeprom *ep;
+	u32 flags;
+
+	if (argc != 2) {
+		usage(argv);
+		return EXIT_FAILURE;
+	}
+
+	errno = 0;
+	flags = strtol(argv[1], NULL, 16);
+	if (errno) {
+		printf("Failed to convert flags, make sure you enter as hex\n");
+		return EXIT_FAILURE;
+	}
+
+	ep = usrp_sulfur_eeprom_from_file(NVMEM_PATH_MB);
+	if (!ep) {
+		printf("eeprom not found\n");
+		return EXIT_FAILURE;
+	}
+
+	usrp_sulfur_eeprom_print(ep);
+
+	/* Set flag */
+	ep->mcu_flags[0] = htonl(flags);
+	usrp_sulfur_eeprom_recrc(ep);
+
+	/* Write out to eeprom */
+	usrp_sulfur_eeprom_to_i2c(ep, "/dev/i2c-2");
+	free(ep);
+
+	printf("-- Reading back \n");
+	ep = usrp_sulfur_eeprom_from_file(NVMEM_PATH_MB);
+	usrp_sulfur_eeprom_print(ep);
+	free(ep);
+}
diff --git a/mpm/tools/eeprom.c b/mpm/tools/eeprom.c
new file mode 100644
index 000000000..e111226cc
--- /dev/null
+++ b/mpm/tools/eeprom.c
@@ -0,0 +1,484 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <inttypes.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "eeprom.h"
+
+
+static const u32 USRP_EEPROM_MAGIC = 0xF008AD10;
+static const u32 USRP_EEPROM_DB_MAGIC = 0xF008AD11;
+static const u32 USRP_EEPROM_VERSION = 1;
+static const u32 USRP_EEPROM_DB_VERSION = 1;
+static const u32 USRP_EEPROM_DEFAULT_MCU_FLAGS[4] = {0x0, 0x0, 0x0, 0x0};
+
+
+/*static const size_t TOTAL_SIZE=256;*/
+static const u8 EEPROM_I2C_ADDR = 0x50;
+
+static const uint32_t crc32_tab[] = {
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+	0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+	0xf3b97148, 0x84be41de,	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,	0x14015c4f, 0x63066cd9,
+	0xfa0f3d63, 0x8d080df5,	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,	0x35b5a8fa, 0x42b2986c,
+	0xdbbbc9d6, 0xacbcf940,	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,	0x76dc4190, 0x01db7106,
+	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+static uint32_t crc32(uint32_t crc, const void *buf, size_t size)
+{
+	const uint8_t *p;
+
+	p = buf;
+	crc = crc ^ ~0U;
+
+	while (size--)
+		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+
+	return crc ^ ~0U;
+}
+
+static int __eth_addr_parse(uint8_t *out, const char *in)
+{
+	/* 00:00:00:00:00:00 */
+	char tmp[18];
+	char *tok;
+	unsigned int ul, i = 0;
+
+	if (strlen(in) < 17)
+		return -1;
+
+	strncpy(tmp, in, sizeof(tmp) - 1);
+	tmp[sizeof(tmp) - 1] = '\0';
+
+	for (tok = strtok(tmp, ":"); tok && (i < ETH_ALEN); tok = strtok(NULL, ":")) {
+		ul = strtoul(tok, NULL, 16);
+		out[i++] = ul & 0xff;
+	}
+
+	return 0;
+}
+
+struct usrp_sulfur_eeprom *usrp_sulfur_eeprom_new(const u32 *mcu_flags,
+						  const u16 pid,
+						  const u16 rev,
+						  const u8 *serial,
+						  const char *eth_addr0,
+						  const char *eth_addr1,
+						  const char *eth_addr2)
+{
+	struct usrp_sulfur_eeprom *ep;
+	int i;
+
+	ep = malloc(sizeof(*ep));
+	if (!ep) {
+		perror("Failed to allocate eeprom struct\n");
+		return NULL;
+	}
+
+	/* it's an eeprom, so just make it 0xff */
+	memset(ep, 0, sizeof(*ep));
+
+	ep->magic = htonl(USRP_EEPROM_MAGIC);
+	ep->version = htonl(USRP_EEPROM_VERSION);
+
+	if (!mcu_flags)
+		mcu_flags = &USRP_EEPROM_DEFAULT_MCU_FLAGS[0];
+
+	for (i = 0; i < 4; ++i)
+		ep->mcu_flags[i] = htonl(mcu_flags[i]);
+
+	ep->pid = htons(pid);
+	ep->rev = htons(rev);
+
+	if (strlen(serial) > 8) {
+		fprintf(stderr, "Serial# too long\n");
+		free(ep);
+		return NULL;
+	}
+
+	memset(ep->serial, '\0', 8);
+	strncpy(ep->serial, serial, 8);
+
+	if (eth_addr0)
+		__eth_addr_parse(ep->eth_addr0, eth_addr0);
+
+	if (eth_addr1)
+		__eth_addr_parse(ep->eth_addr1, eth_addr1);
+
+	if (eth_addr2)
+		__eth_addr_parse(ep->eth_addr2, eth_addr2);
+
+	ep->crc = htonl(crc32(0, &ep->magic, sizeof(*ep)-4));
+
+	return ep;
+}
+
+static int __usrp_sulfur_eeprom_check_crc(const struct usrp_sulfur_eeprom *ep)
+{
+	uint32_t crc;
+
+	crc = crc32(0, &ep->magic, sizeof(*ep) - 4);
+
+	return (crc != ep->crc);
+}
+
+static int __usrp_sulfur_db_eeprom_check_crc(const struct usrp_sulfur_db_eeprom *ep)
+{
+	uint32_t crc;
+
+	crc = crc32(0, &ep->magic, sizeof(*ep) - 4);
+
+	return (crc != ep->crc);
+}
+
+void usrp_sulfur_eeprom_print(const struct usrp_sulfur_eeprom *ep)
+{
+	int i;
+
+	if (!ep) {
+		fprintf(stderr, "ep not valid!\n");
+		return;
+	}
+
+	printf("-- PID/REV: %04x %04x\n", ntohs(ep->pid), ntohs(ep->rev));
+	for (i = 0; i < 4; ++i)
+		printf("-- MCU_FLAGS[%u]: %08x\n", i, ntohl(ep->mcu_flags[i]));
+	printf("-- Serial: %s\n", ep->serial);
+
+	printf("-- eth_addr0: %02x:%02x:%02x:%02x:%02x:%02x\n",
+	       ep->eth_addr0[0], ep->eth_addr0[1], ep->eth_addr0[2],
+	       ep->eth_addr0[3], ep->eth_addr0[4], ep->eth_addr0[5]);
+	printf("-- eth_addr1: %02x:%02x:%02x:%02x:%02x:%02x\n",
+	       ep->eth_addr1[0], ep->eth_addr1[1], ep->eth_addr1[2],
+	       ep->eth_addr1[3], ep->eth_addr1[4],
+	       ep->eth_addr1[5]);
+	printf("-- eth_addr2: %02x:%02x:%02x:%02x:%02x:%02x\n",
+	       ep->eth_addr2[0], ep->eth_addr2[1], ep->eth_addr2[2],
+	       ep->eth_addr2[3], ep->eth_addr2[4], ep->eth_addr2[5]);
+
+	printf("-- CRC: %08x (%s)\n", ntohl(ep->crc),
+	       __usrp_sulfur_eeprom_check_crc(ep) ? "matches": "doesn't match!");
+}
+
+struct usrp_sulfur_eeprom *usrp_sulfur_eeprom_from_file(const char *path)
+{
+	int fd;
+	struct usrp_sulfur_eeprom *ep;
+	size_t len = sizeof(*ep);
+	size_t got = 0;
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		perror("Could not open file:\n");
+		return NULL;
+	}
+
+	ep = malloc(sizeof(*ep));
+	if (!ep) {
+		perror("Could not allocate struct");
+		return ep;
+	}
+
+	u8 *rptr = (u8*)ep;
+
+	while(len) {
+		got = read(fd, rptr, len);
+		len -= got;
+		rptr += got;
+	}
+
+	close(fd);
+	if (ep->magic != ntohl(USRP_EEPROM_MAGIC)) {
+		free(ep);
+		return NULL;
+	}
+
+	return ep;
+}
+
+void usrp_sulfur_eeprom_to_file(struct usrp_sulfur_eeprom *ep, const char *path)
+{
+	int fd;
+	size_t len = sizeof(*ep);
+	size_t got = 0;
+
+	fd = open(path, O_WRONLY | O_CREAT);
+	if (fd < 0) {
+		perror("Could not open file:\n");
+		return;
+	}
+
+	u8 *rptr = (u8*)ep;
+
+	while(len) {
+		got = write(fd, rptr, len);
+		len -= got;
+		rptr += got;
+	}
+
+	close(fd);
+
+	return;
+}
+
+void usrp_sulfur_db_eeprom_to_file(struct usrp_sulfur_db_eeprom *ep, const char *path)
+{
+	int fd;
+	size_t len = sizeof(*ep);
+	size_t got = 0;
+
+	fd = open(path, O_WRONLY | O_CREAT);
+	if (fd < 0) {
+		perror("Could not open file:\n");
+		return;
+	}
+
+	u8 *rptr = (u8*)ep;
+
+	while(len) {
+		got = write(fd, rptr, len);
+		len -= got;
+		rptr += got;
+	}
+
+	close(fd);
+
+	return;
+}
+
+
+static int set_i2c_reg(int fd, const u8 addr, const u8 reg,
+		       const u8 val)
+{
+	int ret;
+	u8 outbuf[2];
+	struct i2c_rdwr_ioctl_data packets;
+	struct i2c_msg messages[1];
+
+	messages[0].addr = addr;
+	messages[0].flags = 0;
+	messages[0].len = sizeof(outbuf);
+	messages[0].buf = outbuf;
+
+	outbuf[0] = reg;
+	outbuf[1] = val;
+
+	packets.msgs = messages;
+	packets.nmsgs = 1;
+
+	ret = ioctl(fd, I2C_RDWR, &packets);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to set register %u\n", reg);
+		return ret;
+	}
+
+	usleep(5 * 1000);
+
+	return 0;
+}
+
+static int get_i2c_reg(int fd, const u8 addr, const u8 reg, u8 *val)
+{
+	int ret;
+	u8 outbuf, inbuf;
+	struct i2c_rdwr_ioctl_data packets;
+	struct i2c_msg messages[2];
+
+	messages[0].addr = addr;
+	messages[0].flags = 0;
+	messages[0].len = sizeof(outbuf);
+	messages[0].buf = &outbuf;
+
+	outbuf = reg;
+
+	messages[1].addr = addr;
+	messages[1].flags = I2C_M_RD;
+	messages[1].len = sizeof(inbuf);
+	messages[1].buf = &inbuf;
+
+	packets.msgs = messages;
+	packets.nmsgs = 2;
+
+	ret = ioctl(fd, I2C_RDWR, &packets);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to get register %u\n", reg);
+		return ret;
+	}
+
+	*val = inbuf;
+
+	return 0;
+}
+
+void usrp_sulfur_eeprom_recrc(struct usrp_sulfur_eeprom *ep)
+{
+	ep->crc = htonl(crc32(0, &ep->magic, sizeof(*ep)-4));
+}
+
+void usrp_sulfur_eeprom_to_i2c(struct usrp_sulfur_eeprom *ep, const char *path)
+{
+	int fd;
+	size_t len = sizeof(*ep);
+	size_t i;
+
+	fd = open(path, O_WRONLY | O_CREAT);
+	if (fd < 0) {
+		perror("Could not open file:\n");
+		return;
+	}
+
+	u8 *rptr = (u8*)ep;
+
+	for (i = 0; i < len; i++)
+		set_i2c_reg(fd, EEPROM_I2C_ADDR, i, *(rptr+i));
+
+	close(fd);
+
+	return;
+}
+
+struct usrp_sulfur_db_eeprom *usrp_sulfur_db_eeprom_new(const u16 pid,
+						     const u16 rev,
+						     const u8 *serial)
+{
+	struct usrp_sulfur_db_eeprom *ep;
+	int i;
+
+	ep = malloc(sizeof(*ep));
+	if (!ep) {
+		perror("Failed to allocate eeprom struct\n");
+		return NULL;
+	}
+
+	/* it's an eeprom, so just make it 0xff */
+	memset(ep, 0, sizeof(*ep));
+
+	ep->magic = htonl(USRP_EEPROM_DB_MAGIC);
+	ep->version = htonl(USRP_EEPROM_DB_VERSION);
+
+	ep->pid = htons(pid);
+	ep->rev = htons(rev);
+
+	if (strlen(serial) > 8) {
+		fprintf(stderr, "Serial# too long\n");
+		free(ep);
+		return NULL;
+	}
+
+	memset(ep->serial, '\0', 8);
+	strncpy(ep->serial, serial, 8);
+
+	ep->crc = htonl(crc32(0, &ep->magic, sizeof(*ep)-4));
+
+	return ep;
+}
+
+struct usrp_sulfur_db_eeprom *usrp_sulfur_db_eeprom_from_file(const char *path)
+{
+	int fd;
+	struct usrp_sulfur_db_eeprom *ep;
+	size_t len = sizeof(*ep);
+	size_t got = 0;
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		return NULL;
+	}
+
+	ep = malloc(sizeof(*ep));
+	if (!ep) {
+		perror("Could not allocate struct");
+		return ep;
+	}
+
+	u8 *rptr = (u8*)ep;
+
+	while(len) {
+		got = read(fd, rptr, len);
+		len -= got;
+		rptr += got;
+	}
+
+	close(fd);
+	if (ep->magic != ntohl(USRP_EEPROM_DB_MAGIC)) {
+		free(ep);
+		return NULL;
+	}
+
+	return ep;
+}
+
+void usrp_sulfur_db_eeprom_print(const struct usrp_sulfur_db_eeprom *ep)
+{
+	if (!ep) {
+		fprintf(stderr, "ep not valid!\n");
+		return;
+	}
+
+	printf("-- PID/REV: %04x %04x\n", ntohs(ep->pid), ntohs(ep->rev));
+	printf("-- Serial: %s\n", ep->serial);
+	printf("-- CRC: %08x (%s)\n", ntohl(ep->crc),
+	       __usrp_sulfur_db_eeprom_check_crc(ep) ? "matches": "doesn't match!");
+}
+
diff --git a/mpm/tools/eeprom.h b/mpm/tools/eeprom.h
new file mode 100644
index 000000000..9b8ef15fb
--- /dev/null
+++ b/mpm/tools/eeprom.h
@@ -0,0 +1,82 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#ifndef EEPROM_H
+#define EEPROM_H
+
+#include <arpa/inet.h>
+
+typedef uint32_t u32;
+typedef uint16_t u16;
+typedef uint8_t u8;
+
+#define ETH_ALEN 6
+
+/* TODO: Come up with a smarter way to do this when we start using this on
+ * another device */
+#define NVMEM_PATH_SLOT_A "/sys/bus/nvmem/devices/9-00500/nvmem"
+#define NVMEM_PATH_SLOT_B "/sys/bus/nvmem/devices/10-00500/nvmem"
+#define NVMEM_PATH_MB "/sys/bus/nvmem/devices/2-00500/nvmem"
+
+struct usrp_sulfur_eeprom {
+	u32 magic;
+	u32 version;
+	u32 mcu_flags[4];
+	u16 pid;
+	u16 rev;
+	u8 serial[8];
+	u8 eth_addr0[ETH_ALEN];
+	u8 __pad_0[2];
+	u8 eth_addr1[ETH_ALEN];
+	u8 __pad_1[2];
+	u8 eth_addr2[ETH_ALEN];
+	u8 __pad_2[2];
+	u32 crc;
+} __attribute__((packed));
+
+struct usrp_sulfur_db_eeprom {
+	u32 magic;
+	u32 version;
+	u16 pid;
+	u16 rev;
+	u8 serial[8];
+	u32 crc;
+
+} __attribute__((packed));
+
+/* Motherboard EEPROM stuff */
+struct usrp_sulfur_eeprom *usrp_sulfur_eeprom_new(const u32 *mcu_flags,
+						  const u16 pid,
+						  const u16 rev,
+						  const u8 *serial,
+						  const char *eth_addr0,
+						  const char *eth_addr1,
+						  const char *eth_addr2);
+
+void usrp_sulfur_eeprom_to_i2c(struct usrp_sulfur_eeprom *ep, const char *path);
+
+void usrp_sulfur_eeprom_to_file(struct usrp_sulfur_eeprom *ep,
+				const char *path);
+
+void usrp_sulfur_eeprom_recrc(struct usrp_sulfur_eeprom *ep);
+
+struct usrp_sulfur_eeprom *usrp_sulfur_eeprom_from_file(const char *path);
+
+void usrp_sulfur_eeprom_print(const struct usrp_sulfur_eeprom *ep);
+
+/* Daughterboard EEPROM stuff */
+struct usrp_sulfur_db_eeprom *usrp_sulfur_db_eeprom_new(const u16 pid,
+							const u16 rev,
+							const u8 *serial);
+
+void usrp_sulfur_db_eeprom_to_file(struct usrp_sulfur_db_eeprom *ep,
+				   const char *path);
+
+struct usrp_sulfur_db_eeprom *usrp_sulfur_db_eeprom_from_file(const char *path);
+
+void usrp_sulfur_db_eeprom_print(const struct usrp_sulfur_db_eeprom *ep);
+
+#endif /* EEPROM_H */
diff --git a/mpm/tools/fan-limits.c b/mpm/tools/fan-limits.c
new file mode 100644
index 000000000..4000d5832
--- /dev/null
+++ b/mpm/tools/fan-limits.c
@@ -0,0 +1,47 @@
+//
+// Copyright 2017 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0
+//
+
+#include "eeprom.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+void usage(char *argv[])
+{
+	printf("-- Usage -- \n");
+	printf("%s fan0_min fan0_max fan1_min fan1_max\n\n", argv[0]);
+	printf("Example:\n");
+	printf("$ %s 3800 13000 3800 1300\n", argv[0]);
+}
+
+int main(int argc, char *argv[])
+{
+	struct usrp_sulfur_eeprom *ep;
+	uint8_t fan0_max, fan0_min, fan1_max, fan1_min;
+	uint32_t new_flags = 0;
+
+	if (argc != 5) {
+		usage(argv);
+		return EXIT_FAILURE;
+	}
+
+	fan0_min = atoi(argv[1]) / 100;
+	fan0_max = atoi(argv[2]) / 100;
+	fan1_min = atoi(argv[3]) / 100;
+	fan1_max = atoi(argv[4]) / 100;
+
+	printf("Writing: %d/%d/%d/%d\n", fan0_min, fan0_max, fan1_min, fan1_max);
+
+	ep = usrp_sulfur_eeprom_from_file(NVMEM_PATH_MB);
+	ep->mcu_flags[0] = 0;
+	ep->mcu_flags[1] = htonl(fan1_max << 24 | fan1_min << 16 | fan0_max << 8 | fan0_min);
+	usrp_sulfur_eeprom_recrc(ep);
+	usrp_sulfur_eeprom_to_i2c(ep, "/dev/i2c-2");
+
+
+	free(ep);
+
+	return 0;
+}