Low-power, embedded non-volatile memory plays an important role in every RFID system. RFID tags typically hold less than 2,000 KB of data, including a unique identifier/serial number. Tags can be read-only or read-write, where data can be added by the reader or existing data overwritten.
passport photo maker 5.15 serial number
A common RFID security or privacy concern is that RFID tag data can be read by anyone with a compatible reader. Tags can often be read after an item leaves a store or supply chain. They can also be read without a user's knowledge using unauthorized readers, and if a tag has a unique serial number, it can be associated to a consumer. While a privacy concern for individuals, in military or medical settings this can be a national security concern or life-or-death matter.
At the reader, information printed on the passport is machine-scanned and used to derive a key for the passport. There are three pieces of information used -- the passport number, the passport holder's birth date and the passport's expiration date -- along with a checksum digit for each of the three.
EEPROM: SiFive PCB EEPROM format v1Product ID: 0002 (HiFive Unmatched)PCB revision: 3BOM revision: BBOM variant: 0Serial number: SF105SZ212200304Ethernet MAC address: 70:b3:d5:92:f7:d4CRC: 1407a8ccIn: serial@10010000Out: serial@10010000Err: serial@10010000Model: SiFive HiFive Unmatched A00Net: eth0: ethernet@10090000Hit any key to stop autoboot: 0Failed to negotiate PCIe link!PHY DEBUG_R0=0x0c000202 DEBUG_R1=0x0800f702Failed to init port.
In order to support unique TFTP boot directories for each Raspberry Pi the bootloader prefixes the filenames with a device specific directory. If neither start4.elf nor start.elf are found in the prefixed directory then the prefix is cleared.On earlier models the serial number is used as the prefix, however, on Raspberry Pi 4 the MAC address is no longer generated from the serial number making it difficult to automatically create tftpboot directories on the server by inspecting DHCPDISCOVER packets. To support this the TFTP_PREFIX may be customized to either be the MAC address, a fixed value or the serial number (default).
In earlier releases the client GUID (Option97) was just the serial number repeated 4 times. By default, the new GUID format isthe concatenation of the fourcc for RPi4 (0x34695052 - little endian), the board revision (e.g. 0x00c03111) (4-bytes), the least significant 4 bytes of the mac address and the 4-byte serial number.This is intended to be unique but also provide structured information to the DHCP server, allowing Raspberry Pi 4 computers to be identified without relying upon the Ethernet MAC OUID.
This option may be set to 0 to block self-update without requiring the EEPROM configuration to be updated. This is sometimes useful when updating multiple Raspberry Pis via network boot because this option can be controlled per Raspberry Pi (e.g. via a serial number filter in config.txt).
From this point the bootcode.bin code continues to load the system. The first file it will try to access is [serial_number]/start.elf. If this does not result in an error then any other files to be read will be pre-pended with the serial_number. This is useful because it enables you to create separate directories with separate start.elf / kernels for your Raspberry Pis.To get the serial number for the device you can either try this boot mode and see what file is accessed using tcpdump / wireshark, or you can run a standard Raspberry Pi OS SD card and cat /proc/cpuinfo.
The above uses the mailbox property interface GET_BOARD_SERIAL with a request size of 8 bytes and response size of 8 bytes (sending two integers for the request 0, 0). The response to this will be two integers (0x00000020 and 0x80000000) followed by the tag code, the request length, the response length (with the 31st bit set to indicate that it is a response) then the 64-bit serial number (where the MS 32 bits are always 0).
[ 0.000000] Booting Linux on physical CPU 0xf00[ 0.000000] Linux version 3.18.6-v7 (noltari@skynet) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r44379) ) #1 SMP Wed Feb 11 05:49:12 CET 2015[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache[ 0.000000] Machine: BCM2709[ 0.000000] cma: Reserved 16 MiB at 0x3a000000[ 0.000000] Memory policy: Data cache writealloc[ 0.000000] [bcm2709_smp_init_cpus] enter (8520->f3003010)[ 0.000000] [bcm2709_smp_init_cpus] ncores=4[ 0.000000] PERCPU: Embedded 9 pages/cpu @b9866000 s7296 r8192 d21376 u36864[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 239776[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2709.boardrev=0xa01041 bcm2709.serial=0x2ce5d0af smsc95xx.macaddr=B8:27:EB:E5:D0:AF bcm2708_fb.fbswap=1 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 sdhci-bcm2708.emmc_clock_freq=250000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 dwc_otg.lpm_enable=0 rpitestmode=1 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait[ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)[ 0.000000] Memory: 936804K/966656K available (3253K kernel code, 213K rwdata, 896K rodata, 168K init, 355K bss, 29852K reserved)[ 0.000000] Virtual kernel memory layout:[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)[ 0.000000] fixmap : 0xffc00000 - 0xffe00000 (2048 kB)[ 0.000000] vmalloc : 0xbb800000 - 0xff000000 (1080 MB)[ 0.000000] lowmem : 0x80000000 - 0xbb000000 ( 944 MB)[ 0.000000] modules : 0x7f000000 - 0x80000000 ( 16 MB)[ 0.000000] .text : 0x80008000 - 0x80415674 (4150 kB)[ 0.000000] .init : 0x80416000 - 0x80440000 ( 168 kB)[ 0.000000] .data : 0x80440000 - 0x80475488 ( 214 kB)[ 0.000000] .bss : 0x80475488 - 0x804ce338 ( 356 kB)[ 0.000000] Hierarchical RCU implementation.[ 0.000000] NR_IRQS:480[ 0.000000] Architected cp15 timer(s) running at 19.20MHz (virt).[ 0.000014] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 3579139424256ns[ 0.000034] Switching to timer-based delay loop, resolution 52ns[ 0.000515] Console: colour dummy device 80x30[ 0.001035] console [tty1] enabled[ 0.001068] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)[ 0.001113] pid_max: default: 32768 minimum: 301[ 0.001451] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)[ 0.001483] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)[ 0.002390] CPU: Testing write buffer coherency: ok[ 0.002807] CPU0: thread -1, cpu 0, socket 15, mpidr 80000f00[ 0.002837] [bcm2709_smp_prepare_cpus] enter[ 0.002956] Setting up static identity map for 0x126e8 - 0x12740[ 0.004741] [bcm2709_boot_secondary] cpu:1 started (0) 16[ 0.004994] CPU1: Booted secondary processor[ 0.005000] [bcm2709_secondary_init] enter cpu:1[ 0.005045] CPU1: thread -1, cpu 1, socket 15, mpidr 80000f01[ 0.005524] [bcm2709_boot_secondary] cpu:2 started (0) 18[ 0.005724] CPU2: Booted secondary processor[ 0.005729] [bcm2709_secondary_init] enter cpu:2[ 0.005759] CPU2: thread -1, cpu 2, socket 15, mpidr 80000f02[ 0.006193] [bcm2709_boot_secondary] cpu:3 started (0) 18[ 0.006370] CPU3: Booted secondary processor[ 0.006375] [bcm2709_secondary_init] enter cpu:3[ 0.006402] CPU3: thread -1, cpu 3, socket 15, mpidr 80000f03[ 0.006477] Brought up 4 CPUs[ 0.006542] SMP: Total of 4 processors activated (153.60 BogoMIPS).[ 0.006563] CPU: All CPU(s) started in SVC mode.[ 0.007252] devtmpfs: initialized[ 0.025372] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5[ 0.027083] NET: Registered protocol family 16[ 0.032716] DMA: preallocated 4096 KiB pool for atomic coherent allocations[ 0.060100] cpuidle: using governor ladder[ 0.090123] cpuidle: using governor menu[ 0.090548] bcm2709.uart_clock = 3000000[ 0.091945] mailbox: Broadcom VideoCore Mailbox driver[ 0.092032] bcm2708_vcio: mailbox at f300b880[ 0.092332] bcm_power: Broadcom power driver[ 0.092358] bcm_power_open() -> 0[ 0.092376] bcm_power_request(0, 8)[ 0.593063] bcm_mailbox_read -> 00000080, 0[ 0.593085] bcm_power_request -> 0[ 0.593225] Serial: AMBA PL011 UART driver[ 0.593343] dev:f1: ttyAMA0 at MMIO 0x3f201000 (irq = 83, base_baud = 0) is a PL011 rev3[ 1.025073] console [ttyAMA0] enabled[ 1.086899] SCSI subsystem initialized[ 1.090846] usbcore: registered new interface driver usbfs[ 1.096429] usbcore: registered new interface driver hub[ 1.101830] usbcore: registered new device driver usb[ 1.108378] Switched to clocksource arch_sys_counter[ 1.123105] NET: Registered protocol family 2[ 1.128304] TCP established hash table entries: 8192 (order: 3, 32768 bytes)[ 1.135500] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)[ 1.142141] TCP: Hash tables configured (established 8192 bind 8192)[ 1.148607] TCP: reno registered[ 1.151849] UDP hash table entries: 512 (order: 2, 16384 bytes)[ 1.157819] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)[ 1.164507] NET: Registered protocol family 1[ 1.169474] bcm2708_dma: DMA manager at f3007000[ 1.174209] bcm2708_gpio: bcm2708_gpio_probe 8045f2e0[ 1.179782] vc-mem: phys_addr:0x00000000 mem_base=0x3dc00000 mem_size:0x3f000000(1008 MiB)[ 1.189350] futex hash table entries: 1024 (order: 4, 65536 bytes)[ 1.196776] msgmni has been set to 1861[ 1.201350] io scheduler noop registered[ 1.205291] io scheduler deadline registered[ 1.209600] io scheduler cfq registered (default)[ 1.215556] BCM2708FB: allocated DMA memory fa400000[ 1.220579] BCM2708FB: allocated DMA channel 0 @ f3007000[ 1.232046] Console: switching to colour frame buffer device 82x26[ 1.243767] bcm2708-dmaengine bcm2708-dmaengine: Load BCM2835 DMA engine driver[ 1.252846] uart-pl011 dev:f1: no DMA platform data[ 1.259468] vc-cma: Videocore CMA driver[ 1.264826] vc-cma: vc_cma_base = 0x00000000[ 1.270955] vc-cma: vc_cma_size = 0x00000000 (0 MiB)[ 1.277725] vc-cma: vc_cma_initial = 0x00000000 (0 MiB)[ 1.293148] brd: module loaded[ 1.301922] loop: module loaded[ 1.306598] vchiq: vchiq_init_state: slot_zero = 0xba000000, is_master = 0[ 1.315775] usbcore: registered new interface driver smsc95xx[ 1.322993] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)[ 1.530327] Core Release: 2.80a[ 1.534741] Setting default values for core params[ 1.540835] Finished setting default values for core params[ 1.747987] Using Buffer DMA mode[ 1.752565] Periodic Transfer Interrupt Enhancement - disabled[ 1.759723] Multiprocessor Interrupt Enhancement - disabled[ 1.766632] OTG VER PARAM: 0, OTG VER FLAG: 0[ 1.772337] Dedicated Tx FIFOs mode[ 1.777495] WARN::dwc_otg_hcd_init:1047: FIQ DMA bounce buffers: virt = 0xba414000 dma = 0xfa414000 len=9024[ 1.790123] FIQ FSM acceleration enabled for :[ 1.790123] Non-periodic Split Transactions[ 1.790123] Periodic Split Transactions[ 1.790123] High-Speed Isochronous Endpoints[ 1.812217] WARN::hcd_init_fiq:412: FIQ on core 1 at 0x80246758[ 1.819571] WARN::hcd_init_fiq:413: FIQ ASM at 0x8000d5a8 length 36[ 1.827249] WARN::hcd_init_fiq:438: MPHI regs_base at 0xbb806000[ 1.834685] dwc_otg bcm2708_usb: DWC OTG Controller[ 1.841016] dwc_otg bcm2708_usb: new USB bus registered, assigned bus number 1[ 1.849707] dwc_otg bcm2708_usb: irq 32, io mem 0x00000000[ 1.856612] Init: Port Power? op_state=1[ 1.861903] Init: Power Port (0)[ 1.866692] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002[ 1.874898] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1[ 1.883523] usb usb1: Product: DWC OTG Controller[ 1.889604] usb usb1: Manufacturer: Linux 3.18.6-v7 dwc_otg_hcd[ 1.896891] usb usb1: SerialNumber: bcm2708_usb[ 1.903597] hub 1-0:1.0: USB hub found[ 1.908768] hub 1-0:1.0: 1 port detected[ 1.914740] usbcore: registered new interface driver uas[ 1.921474] usbcore: registered new interface driver usb-storage[ 1.928954] mousedev: PS/2 mouse device common for all mice[ 1.935921] bcm2708 watchdog, heartbeat=10 sec (nowayout=0)[ 1.942862] sdhci: Secure Digital Host Controller Interface driver[ 1.950371] sdhci: Copyright(c) Pierre Ossman[ 1.956152] DMA channels allocated for the MMC driver[ 1.998392] Load BCM2835 MMC driver[ 2.007731] sdhci-pltfm: SDHCI platform and OF driver helper[ 2.015336] TCP: cubic registered[ 2.021021] NET: Registered protocol family 17[ 2.027892] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to load br_netfilter if you need this.[ 2.045301] 8021q: 802.1Q VLAN Support v1.8[ 2.055399] Registering SWP/SWPB emulation handler[ 2.062464] vc-sm: Videocore shared memory driver[ 2.068588] [vc_sm_connected_init]: start[ 2.075499] [vc_sm_connected_init]: end - returning 0[ 2.082521] Waiting for root device /dev/mmcblk0p2...[ 2.096321] mmc0: host does not support reading read-only switch, assuming write-enable[ 2.108489] Indeed it is in host mode hprt0 = 00021501[ 2.109504] mmc0: new high speed SD card at address b368[ 2.109941] mmcblk0: mmc0:b368 SMI 121 MiB [ 2.123103] mmcblk0: p1 p2[ 2.203606] EXT4-fs (mmcblk0p2): warning: mounting unchecked fs, running e2fsck is recommended[ 2.231261] EXT4-fs (mmcblk0p2): mounted filesystem without journal. Opts: (null)[ 2.241906] VFS: Mounted root (ext4 filesystem) on device 179:2.[ 2.249811] Freeing unused kernel memory: 168K (80416000 - 80440000)[ 2.308468] usb 1-1: new high-speed USB device number 2 using dwc_otg[ 2.316756] Indeed it is in host mode hprt0 = 00001101[ 2.518697] usb 1-1: New USB device found, idVendor=0424, idProduct=9514[ 2.527063] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0[ 2.536653] hub 1-1:1.0: USB hub found[ 2.542164] hub 1-1:1.0: 5 ports detected[ 2.828459] usb 1-1.1: new high-speed USB device number 3 using dwc_otg[ 2.948631] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00[ 2.957097] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0[ 2.968730] smsc95xx v1.0.4[ 3.031489] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:e5:d0:af[ 3.414970] random: mktemp urandom read with 71 bits of entropy available[ 6.504878] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)øøPlease press Enter to activate this console.[ 10.590730] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup[ 10.605472] device eth0 entered promiscuous mode[ 20.672522] random: nonblocking pool is initialized 2ff7e9595c
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