下面有很多日志和其他内容，所以跳到重点：我有一个链接器脚本，并在其中设置变量，并使用这些变量来设置内存部分。但似乎这些变量总是被设置为 0，无论我在脚本中将它们设置为什么。
我正在编写一个链接器脚本，试图为嵌入式系统应用程序向我的输出精灵添加两个新的内存部分。我试图砍掉预先存在的 RAM 内存部分的第一位，相应地更改 RAM 的大小，然后将我的新部分放在那里。
以前，使用 nrf52840 开发板和这个库，我可以修改示例应用程序之一的链接器脚本，如下所示：
SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)
__NewSection1Start = 0x20000000;
__TotalLength = 0x1000;
__NewSection2Length = __TotalLength / 2;
__NewSection1Length = __TotalLength / 2;
__NewSection2Start = __NewSection1Start + __NewSection1Length;
MEMORY
{
FLASH (rx) : ORIGIN = 0x0, LENGTH = 0xff000
NEWSECTION1 (rwx) : ORIGIN = __NewSection1Start, LENGTH = __NewSection1Length
NEWSECTION2 (rwx) : ORIGIN = __NewSection2Start, LENGTH = __NewSection2Length
RAM (rwx) : ORIGIN = 0x20000000 + __TotalLength, LENGTH = 0x40000
}
FLASH_PAGE_SIZE = 4096;
FLASH_DATA_PAGES_USED = 4;
SECTIONS
{
.newsection1 :
{
KEEP (*(.newsection1));
} > NEWSECTION1
.newsection2 :
{
KEEP (*(.newsection2));
} > NEWSECTION2
}
...
这非常有效。最近，我需要使用 Zephyr RTOS 移植到 nrf9160，因此我开始在此链接上使用构建在 Zephyr 之上的 NordicPlayground nrf 库，修改其中的一个示例应用程序。在尝试使用与此类似的技术为该板和环境重写程序时，我对 Zephyr 链接器脚本做了类似的事情，并像以前一样对其进行了修改。构建过程以某种方式采用我所做的并build/spm/zephyr/linker.cmd在构建输出文件夹中生成文件：
__TotalLength = 0x1000;
__NewSection1Start = 0x20000000;
__NewSection2Length = __TotalLength / 2;
__NewSection1Length = __TotalLength / 2;
__NewSection2Start = __NewSection1Start + __NewSection1Length;
MEMORY
{
FLASH (rx) : ORIGIN = 0x0, LENGTH = 0xc000
SRAM (wx) : ORIGIN = 0x20000000 + __TotalLength, LENGTH = (64 * 1K) - __TotalLength
NEWSECTION1 (rwx) : ORIGIN = __NewSection1Start, LENGTH = __NewSection1Length
NEWSECTION2 (rwx) : ORIGIN = __NewSection2Start, LENGTH = __NewSection2Length
IDT_LIST (wx) : ORIGIN = (0x20000000 + (64 * 1K)), LENGTH = 2K
}
ENTRY("__start")
SECTIONS
{
.newsection1 :
{
KEEP (*(.newsection1));
} > NEWSECTION1
.newsection2 :
{
KEEP (*(.newsection2));
} > NEWSECTION2
}
...
然而，虽然我认为这两个脚本的行为应该相同，但尝试使用 Zephyr RTOS 编译和链接 nrf9160 版本会引发此错误：
riley@riley-Blade:~<code_base>/nrf/samples/nrf9160/example_app$ west build -b nrf9160_pca10090ns
source directory: /home/riley<code_base>/nrf/samples/nrf9160/example_app
build directory: /home/riley<code_base>/nrf/samples/nrf9160/example_app/build
BOARD: nrf9160_pca10090ns (origin: CMakeCache.txt)
[6/17] Linking C executable spm/zephyr/spm_zephyr_prebuilt.elf
Memory region Used Size Region Size %age Used
FLASH: 32 KB 48 KB 66.67%
SRAM: 10000 B 60 KB 16.28%
NEWSECTION1: 0 GB 2 KB 0.00%
NEWSECTION2: 0 GB 2 KB 0.00%
IDT_LIST: 40 B 2 KB 1.95%
[12/17] Linking C executable zephyr/zephyr_prebuilt.elf
FAILED: zephyr/zephyr_prebuilt.elf
: && ccache /home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc zephyr/CMakeFiles/zephyr_prebuilt.dir/misc/empty_file.c.obj -o zephyr/zephyr_prebuilt.elf -Wl,-T zephyr/linker.cmd -Wl,-Map=/home/riley<code_base>/nrf/samples/nrf9160/example_app/build/zephyr/zephyr.map -u_OffsetAbsSyms -u_ConfigAbsSyms -Wl,--whole-archive app/libapp.a zephyr/libzephyr.a zephyr/arch/arm/core/libarch__arm__core.a zephyr/arch/arm/core/cortex_m/libarch__arm__core__cortex_m.a zephyr/arch/arm/core/cortex_m/mpu/libarch__arm__core__cortex_m__mpu.a zephyr/lib/libc/minimal/liblib__libc__minimal.a zephyr/subsys/net/libsubsys__net.a zephyr/subsys/net/ip/libsubsys__net__ip.a zephyr/drivers/gpio/libdrivers__gpio.a zephyr/drivers/serial/libdrivers__serial.a zephyr/modules/nrf/lib/bsdlib/lib..__nrf__lib__bsdlib.a zephyr/modules/nrf/lib/at_host/lib..__nrf__lib__at_host.a zephyr/modules/nrf/drivers/at_cmd/lib..__nrf__drivers__at_cmd.a /home/riley<code_base>/nrfxlib/bsdlib/lib/cortex-m33/hard-float/libbsd_nrf9160_xxaa.a -Wl,--no-whole-archive zephyr/kernel/libkernel.a zephyr/CMakeFiles/offsets.dir/arch/arm/core/offsets/offsets.c.obj -L"/home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/thumb/v8-m.main+fp/hard" -L/home/riley<code_base>/nrf/samples/nrf9160/example_app/build/zephyr -lgcc -Wl,--print-memory-usage /home/riley<code_base>/nrfxlib/crypto/nrf_oberon/lib/cortex-m33/hard-float/liboberon_3.0.0.a -lc -mthumb -mcpu=cortex-m33 -mfpu=fpv5-sp-d16 -Wl,--gc-sections -Wl,--build-id=none -Wl,--sort-common=descending -Wl,--sort-section=alignment -nostdlib -static -no-pie -Wl,-X -Wl,-N -Wl,--orphan-handling=warn -mabi=aapcs -march=armv8-m.main+dsp libspmsecureentries.a && :
Memory region Used Size Region Size %age Used
FLASH: 110428 B 976 KB 11.05%
SRAM: 24608 B 124 KB 19.38%
NEWSECTION1: 264 B 0 GB inf%
NEWSECTION2: 1 B 0 GB inf%
IDT_LIST: 120 B 2 KB 5.86/home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: zephyr/zephyr_prebuilt.elf section `.newsection1' will not fit in region `NEWSECTION1'
/home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: zephyr/zephyr_prebuilt.elf section `.newsection2' will not fit in region `NEWSECTION2'
/home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: section .newsection2 LMA [0000000000000000,0000000000000000] overlaps section .newsection1 LMA [0000000000000000,0000000000000107]
/home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: region `NEWSECTION1' overflowed by 264 bytes
/home/riley/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: region `NEWSECTION2' overflowed by 1 byte
collect2: error: ld returned 1 exit status
%
ninja: build stopped: subcommand failed.
ERROR: command exited with status 1: /home/riley/.local/bin/cmake --build /home/riley<code_base>/nrf/samples/nrf9160/example_app/build
这对我来说真的很奇怪，因为这个输出使它看起来像NEWSECTION1并且NEWSECTION2长度为 0 并且都从 address 开始0x0，但是查看使用的链接描述文件绝对不应该是这种情况。更令人困惑的是，如果我替换__NewSection1Length为0x500或类似的东西，那么内存部分会很0x500B长，这意味着错误似乎是在此链接描述文件中使用变量被忽略或设置为 0？任何帮助将不胜感激。