3.7.8 LTC Connector The board has a 14-pin header, which is originally used to communicate with various daughter cards from Linear Technology. It is connected to the SPI Master and I2C ports of HPS. The communication with these two protocols is bi-directional. The 14-pin header can also be used for GPIO, SPI, or I2C based communication with the HPS. Connections between the HPS and LTC connector are shown in Figure 3-37, and the pin assignment of LTC connector is listed in Table 3-31.
These are some NIOS-V cpu examples implemented and running on a Terasic DE0-NANO board (Cyclone IV - EP4C22F17C6) (Built using Intel Quartus 23.1.1 Standard Edition)
Can be used to pad other options so that they are aligned to the word boundary; is not followed by length byte
1
Subnet mask
4 octets
Client's subnet mask as perRFC 950. If both the subnet mask and the router option (option 3) are included, the subnet mask option must be first.
2
Time offset
4 octets
Time offset of the client's subnet in seconds from Coordinated Universal Time (UTC). The offset is expressed as a two's complement 32-bit integer. A positive offset indicates a location east of the zero meridian and a negative offset indicates a location west of the zero meridian.
3
Router
Multiples of 4 octets
Available routers, should be listed in order of preference
4
Time server
Multiples of 4 octets
AvailableTime Protocolservers to synchronise with, should be listed in order of preference
5
Name server
Multiples of 4 octets
AvailableIEN 116name servers, should be listed in order of preference
6
Domain name server
Multiples of 4 octets
AvailableDNSservers, should be listed in order of preference
7
Log server
Multiples of 4 octets
Available log servers, should be listed in order of preference
8
Cookie server
Multiples of 4 octets
Cookiein this case means "fortune cookie" or "quote of the day", a pithy or humorous anecdote often sent as part of a logon process on large computers; it has nothing to do withcookies sent by websites.
This appendix contains DHCP options and BOOTP vendor extensions from RFC 2132, and includes the validation type for each option, as indicated in Table 10: DHCPv4 Options by Number , on page 23.
The following sections describe the DHCP options in detail: • RFC 1497 Vendor Extensions, on page 1
DHCP option 43 / 25DHCP (Dynamic Host Configuration Protocol) 에는 클라이언트가 DHCP 서버로부터 정보를 요청할 때 클라이언트에게 송신할 수 있는 많은 구성 옵션이 있습니다. 검색 도구를 사용하여 모든 DHCP 옵션을 볼 수 있습니다.
DHCP 옵션은 DHCP 서버가 IP 주소와 함께 클라이언트에게 전달하는 추가적인 구성 데이터를 정의합니다. 일반적인 옵션에는 서브네트 마스크, 도메인명, 라우터 IP 주소, 도메인명 서버 IP 주소 및 정적 라우트가 포함됩니다.
RFC 2132: DHCP 옵션 및 BOOTP 공급업체 확장의 정의를 기반으로 하는 표준 DHCP 옵션이 다음 표에 설명되어 있습니다. IBM Navigator FOR I의 DHCP 옵션 표시를 사용하여 사용자 지정 옵션을 구성할 수도 있습니다.
__bss_start = .; .bss : { bss = .; *(.bss) } . = ALIGN(4096); /* align to page size */ __bss_end = .; __bss_size = __bss_end - __bss_start; __end = .; } : 저 변수들은 실제 저안에서 사용된다기 보다는 소스 코드(C 파일 혹은 어셈블리어 파일)상에서 사용되면서 의미가 부여된다. 저 변수들을 소스 코드상에서 불러 오려면 어떻게 해야 할까? 아래의 코드를 보자.
/* ****************************************************************************** ** ** File : LinkerScript.ld ** ** Author : STM32CubeIDE ** ** Abstract : Linker script for STM32H7 series ** 1024Kbytes FLASH ** 800Kbytes RAM ** ** Set heap size, stack size and stack location according ** to application requirements. ** ** Set memory bank area and size if external memory is used. ** ** Target : STMicroelectronics STM32 ** ** Distribution: The file is distributed as is without any warranty ** of any kind. ** ***************************************************************************** ** @attention ** ** Copyright (c) 2024 STMicroelectronics. ** All rights reserved. ** ** This software is licensed under terms that can be found in the LICENSE file ** in the root directory of this software component. ** If no LICENSE file comes with this software, it is provided AS-IS. ** ***************************************************************************** */
/* Entry Point */ ENTRY(Reset_Handler)
/* Highest address of the user mode stack */ _estack = ORIGIN(RAM_D1) + LENGTH(RAM_D1); /* end of "RAM_D1" Ram type memory */
_Min_Heap_Size = 0x200; /* required amount of heap */ _Min_Stack_Size = 0x400; /* required amount of stack */
/* Sections */ SECTIONS { /* The startup code into "FLASH" Rom type memory */ .isr_vector : { . = ALIGN(4); KEEP(*(.isr_vector)) /* Startup code */ . = ALIGN(4); } >FLASH
/* The program code and other data into "FLASH" Rom type memory */ .text : { . = ALIGN(4); *(.text) /* .text sections (code) */ *(.text*) /* .text* sections (code) */ *(.glue_7) /* glue arm to thumb code */ *(.glue_7t) /* glue thumb to arm code */ *(.eh_frame)
KEEP (*(.init)) KEEP (*(.fini))
. = ALIGN(4); _etext = .; /* define a global symbols at end of code */ } >FLASH
/* Constant data into "FLASH" Rom type memory */ .rodata : { . = ALIGN(4); *(.rodata) /* .rodata sections (constants, strings, etc.) */ *(.rodata*) /* .rodata* sections (constants, strings, etc.) */ . = ALIGN(4); } >FLASH
.ARM.extab (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { . = ALIGN(4); *(.ARM.extab* .gnu.linkonce.armextab.*) . = ALIGN(4); } >FLASH .ARM (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { . = ALIGN(4); __exidx_start = .; *(.ARM.exidx*) __exidx_end = .; . = ALIGN(4); } >FLASH
.preinit_array (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { . = ALIGN(4); PROVIDE_HIDDEN (__preinit_array_start = .); KEEP (*(.preinit_array*)) PROVIDE_HIDDEN (__preinit_array_end = .); . = ALIGN(4); } >FLASH
.init_array (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { . = ALIGN(4); PROVIDE_HIDDEN (__init_array_start = .); KEEP (*(SORT(.init_array.*))) KEEP (*(.init_array*)) PROVIDE_HIDDEN (__init_array_end = .); . = ALIGN(4); } >FLASH
.fini_array (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { . = ALIGN(4); PROVIDE_HIDDEN (__fini_array_start = .); KEEP (*(SORT(.fini_array.*))) KEEP (*(.fini_array*)) PROVIDE_HIDDEN (__fini_array_end = .); . = ALIGN(4); } >FLASH
/* Used by the startup to initialize data */ _sidata = LOADADDR(.data);
/* Initialized data sections into "RAM" Ram type memory */ .data : { . = ALIGN(4); _sdata = .; /* create a global symbol at data start */ *(.data) /* .data sections */ *(.data*) /* .data* sections */ *(.RamFunc) /* .RamFunc sections */ *(.RamFunc*) /* .RamFunc* sections */
. = ALIGN(4); _edata = .; /* define a global symbol at data end */ } >RAM_D1 AT> FLASH
/* Uninitialized data section into "RAM" Ram type memory */ . = ALIGN(4); .bss : { /* This is used by the startup in order to initialize the .bss section */ _sbss = .; /* define a global symbol at bss start */ __bss_start__ = _sbss; *(.bss) *(.bss*) *(COMMON)
. = ALIGN(4); _ebss = .; /* define a global symbol at bss end */ __bss_end__ = _ebss; } >RAM_D1
/* User_heap_stack section, used to check that there is enough "RAM" Ram type memory left */ ._user_heap_stack : { . = ALIGN(8); PROVIDE ( end = . ); PROVIDE ( _end = . ); . = . + _Min_Heap_Size; . = . + _Min_Stack_Size; . = ALIGN(8); } >RAM_D1
/* Remove information from the compiler libraries */ /DISCARD/ : { libc.a ( * ) libm.a ( * ) libgcc.a ( * ) }
.ARM.attributes 0 : { *(.ARM.attributes) } }
CM4 ld
/* ****************************************************************************** ** ** File : LinkerScript.ld ** ** Author : STM32CubeIDE ** ** Abstract : Linker script for STM32H7 series ** 1024Kbytes FLASH and 288Kbytes RAM ** ** Set heap size, stack size and stack location according ** to application requirements. ** ** Set memory bank area and size if external memory is used. ** ** Target : STMicroelectronics STM32 ** ** Distribution: The file is distributed as is, without any warranty ** of any kind. ** ***************************************************************************** ** @attention ** ** Copyright (c) 2024 STMicroelectronics. ** All rights reserved. ** ** This software is licensed under terms that can be found in the LICENSE file ** in the root directory of this software component. ** If no LICENSE file comes with this software, it is provided AS-IS. ** **************************************************************************** */
/* Entry Point */ ENTRY(Reset_Handler)
/* Highest address of the user mode stack */ _estack = ORIGIN(RAM) + LENGTH(RAM); /* end of RAM */ /* Generate a link error if heap and stack don't fit into RAM */ _Min_Heap_Size = 0x200; /* required amount of heap */ _Min_Stack_Size = 0x400; /* required amount of stack */
/* The program code and other data goes into FLASH */ .text : { . = ALIGN(4); *(.text) /* .text sections (code) */ *(.text*) /* .text* sections (code) */ *(.glue_7) /* glue arm to thumb code */ *(.glue_7t) /* glue thumb to arm code */ *(.eh_frame)
KEEP (*(.init)) KEEP (*(.fini))
. = ALIGN(4); _etext = .; /* define a global symbols at end of code */ } >FLASH
.ARM.extab (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH .ARM (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { __exidx_start = .; *(.ARM.exidx*) __exidx_end = .; } >FLASH
.preinit_array (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { PROVIDE_HIDDEN (__preinit_array_start = .); KEEP (*(.preinit_array*)) PROVIDE_HIDDEN (__preinit_array_end = .); } >FLASH .init_array (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { PROVIDE_HIDDEN (__init_array_start = .); KEEP (*(SORT(.init_array.*))) KEEP (*(.init_array*)) PROVIDE_HIDDEN (__init_array_end = .); } >FLASH .fini_array (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */ { PROVIDE_HIDDEN (__fini_array_start = .); KEEP (*(SORT(.fini_array.*))) KEEP (*(.fini_array*)) PROVIDE_HIDDEN (__fini_array_end = .); } >FLASH
/* used by the startup to initialize data */ _sidata = LOADADDR(.data);
/* Initialized data sections goes into RAM, load LMA copy after code */ .data : { . = ALIGN(4); _sdata = .; /* create a global symbol at data start */ *(.data) /* .data sections */ *(.data*) /* .data* sections */ *(.RamFunc) /* .RamFunc sections */ *(.RamFunc*) /* .RamFunc* sections */
. = ALIGN(4); _edata = .; /* define a global symbol at data end */ } >RAM AT> FLASH
/* Uninitialized data section */ . = ALIGN(4); .bss : { /* This is used by the startup in order to initialize the .bss section */ _sbss = .; /* define a global symbol at bss start */ __bss_start__ = _sbss; *(.bss) *(.bss*) *(COMMON)
. = ALIGN(4); _ebss = .; /* define a global symbol at bss end */ __bss_end__ = _ebss; } >RAM
/* User_heap_stack section, used to check that there is enough RAM left */ ._user_heap_stack : { . = ALIGN(8); PROVIDE ( end = . ); PROVIDE ( _end = . ); . = . + _Min_Heap_Size; . = . + _Min_Stack_Size; . = ALIGN(8); } >RAM
/* Remove information from the standard libraries */ /DISCARD/ : { libc.a ( * ) libm.a ( * ) libgcc.a ( * ) }
