This project aims to extract more detailed information about the memory layout of an elf file.
What we want is to know how the various memory regions are divided between
.text (code), .data (initialized data), .bss (uninitialized data).
Eventually also dissect further .text to highlight also .rodata (constant
data).
In addition to this we would like to have the detail of the symbols, their
allocation in the regions and especially the source file where these symbols
are declared, or at least the .o file that contains the symbol. This allows
us to be able to find bottlenecks in memory usage: Which symbols are the largest
and which source file declares them. This allows us to do static profiling
of memory usage.
Using the tools available in the binutils, you can't dissect that deep.
I started with SDK 2.5.1 for NXP i.MX RT1050. I took the example
evkbimxrt1050_sai_interrupt_transfer configured in two different ways:
- link-to-ram project
- flash project
In the repository I added also the elf files (with extension .axf) and the map files:
-rwxrwxr-x 1 max max 1948540 apr 17 13:19 evkbimxrt1050_sai_interrupt_transfer_flash.axf*
-rw-rw-r-- 1 max max 287069 apr 17 13:19 evkbimxrt1050_sai_interrupt_transfer_flash.map
-rwxrwxr-x 1 max max 1773648 apr 20 20:18 evkbimxrt1050_sai_interrupt_transfer_link-to-ram.axf*
-rw-rw-r-- 1 max max 285750 apr 20 20:18 evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map
During the link ld can give some information with the parameter -print-memory-usage.
There is also the option to use the size command of the toolchain.
The linker gives this information:
Memory region Used Size Region Size %age Used
BOARD_FLASH: 0 GB 64 MB 0.00%
SRAM_ITC: 83384 B 128 KB 63.62%
SRAM_DTC: 8796 B 128 KB 6.71%
SRAM_OC: 0 GB 256 KB 0.00%
BOARD_SDRAM: 0 GB 32 MB 0.00%
size conmmand says:
text data bss dec hex filename
83356 28 8768 92152 167f8 evkbimxrt1050_sai_interrupt_transfer_link-to-ram.axf
The linker gives this information:
Memory region Used Size Region Size %age Used
BOARD_FLASH: 91580 B 64 MB 0.14%
SRAM_DTC: 8796 B 128 KB 6.71%
SRAM_ITC: 0 GB 128 KB 0.00%
SRAM_OC: 0 GB 256 KB 0.00%
BOARD_SDRAM: 0 GB 32 MB 0.00%
size conmmand says:
text data bss dec hex filename
91552 28 8768 100348 187fc evkbimxrt1050_sai_interrupt_transfer_flash.axf
Its primary goal is to extract information about memory regions from the map file, in order to insert them into the elf file.
It extracts the information and serializes it into JSON. Alternatively it can print them in human format.
Q: Why not extract the information from the elf file?
A: Because in the elf the information is incomplete, and needs to be interpreted.Q: Why not extract the information from the linker scripts?
A: In linker scripts, memory regions often contain symbols, formulas, or linker scripts include others. So I preferred to start from the map file that contains a description of the regions already processed and usable.
$ python3 memRegion.py --help
usage: memRegion.py [-h] [--human] mapfile
positional arguments:
mapfile input map file
optional arguments:
-h, --help show this help message and exit
--human print human readable
$ python3 memRegion.py --human evkbimxrt1050_sai_interrupt_transfer_flash.map
Name Origin Length Attributes
BOARD_FLASH 0x0000000060000000 0x0000000004000000 xr
SRAM_DTC 0x0000000020000000 0x0000000000020000 xrw
SRAM_ITC 0x0000000000000000 0x0000000000020000 xrw
SRAM_OC 0x0000000020200000 0x0000000000040000 xrw
BOARD_SDRAM 0x0000000080000000 0x0000000002000000 xrw
$ python3 memRegion.py --human evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map
Name Origin Length Attributes
BOARD_FLASH 0x0000000060000000 0x0000000004000000 xr
SRAM_ITC 0x0000000000000000 0x0000000000020000 xrw
SRAM_DTC 0x0000000020000000 0x0000000000020000 xrw
SRAM_OC 0x0000000020200000 0x0000000000040000 xrw
BOARD_SDRAM 0x0000000080000000 0x0000000002000000 xrw
This is almost the same format as the memory regions within the map file.
$ python3 memRegion.py evkbimxrt1050_sai_interrupt_transfer_flash.map
{"BOARD_FLASH": {"Origin": 1610612736, "Length": 67108864, "Attributes": "xr"}, "SRAM_DTC": {"Origin": 536870912, "Length": 131072, "Attributes": "xrw"}, "SRAM_ITC": {"Origin": 0, "Length": 131072, "Attributes": "xrw"}, "SRAM_OC": {"Origin": 538968064, "Length": 262144, "Attributes": "xrw"}, "BOARD_SDRAM": {"Origin": 2147483648, "Length": 33554432, "Attributes": "xrw"}}
$ python3 memRegion.py evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map
{"BOARD_FLASH": {"Origin": 1610612736, "Length": 67108864, "Attributes": "xr"}, "SRAM_ITC": {"Origin": 0, "Length": 131072, "Attributes": "xrw"}, "SRAM_DTC": {"Origin": 536870912, "Length": 131072, "Attributes": "xrw"}, "SRAM_OC": {"Origin": 538968064, "Length": 262144, "Attributes": "xrw"}, "BOARD_SDRAM": {"Origin": 2147483648, "Length": 33554432, "Attributes": "xrw"}}
$ arm-none-eabi-objcopy --add-section .memory_configuration=<(python3 memRegion.py evkbimxrt1050_sai_interrupt_transfer_flash.map) evkbimxrt1050_sai_interrupt_transfer_flash.axf evkbimxrt1050_sai_interrupt_transfer_flash_and_Region.elf
$ arm-none-eabi-readelf -S evkbimxrt1050_sai_interrupt_transfer_flash_and_Region.elf
There are 30 section headers, starting at offset 0x1db890:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .boot_hdr PROGBITS 60000000 010000 002000 00 A 0 0 4
[ 2] .text PROGBITS 60002000 012000 0145a0 00 AX 0 0 4
[ 3] .data PROGBITS 20000000 030000 00001c 00 WA 0 0 4
[ 4] .data_RAM2 PROGBITS 00000000 03001c 000000 00 W 0 0 4
[ 5] .data_RAM3 PROGBITS 20200000 03001c 000000 00 W 0 0 4
[ 6] .data_RAM4 PROGBITS 80000000 03001c 000000 00 W 0 0 4
[ 7] .bss NOBITS 2000001c 01001c 000240 00 WA 0 0 4
[ 8] .uninit_RESERVED PROGBITS 20000000 03001c 000000 00 W 0 0 4
[ 9] .noinit_RAM2 PROGBITS 00000000 03001c 000000 00 W 0 0 4
[10] .noinit_RAM3 PROGBITS 20200000 03001c 000000 00 W 0 0 4
[11] .noinit_RAM4 PROGBITS 80000000 03001c 000000 00 W 0 0 4
[12] .noinit PROGBITS 2000025c 03001c 000000 00 W 0 0 4
[13] .heap NOBITS 2000025c 01001c 001000 00 WA 0 0 4
[14] .heap2stackfill NOBITS 2000125c 01001c 001000 00 WA 0 0 1
[15] .stack PROGBITS 2001f000 03001c 000000 00 W 0 0 4
[16] .debug_info PROGBITS 00000000 03001c 0165b9 00 0 0 1
[17] .debug_abbrev PROGBITS 00000000 0465d5 0025bc 00 0 0 1
[18] .debug_aranges PROGBITS 00000000 048b91 0010d8 00 0 0 1
[19] .debug_macro PROGBITS 00000000 049c69 02a195 00 0 0 1
[20] .debug_line PROGBITS 00000000 073dfe 006bdd 00 0 0 1
[21] .debug_str PROGBITS 00000000 07a9db 1542bd 01 MS 0 0 1
[22] .comment PROGBITS 00000000 1cec98 00007f 01 MS 0 0 1
[23] .ARM.attributes ARM_ATTRIBUTES 00000000 1ced17 000035 00 0 0 1
[24] .debug_ranges PROGBITS 00000000 1ced4c 000f80 00 0 0 1
[25] .debug_frame PROGBITS 00000000 1cfccc 003d10 00 0 0 4
[26] .memory_configura PROGBITS 00000000 1d39dc 000175 00 0 0 1
[27] .symtab SYMTAB 00000000 1d3b54 004ce0 10 28 728 4
[28] .strtab STRTAB 00000000 1d8834 002f10 00 0 0 1
[29] .shstrtab STRTAB 00000000 1db744 00014b 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
y (purecode), p (processor specific)
Q: Why embed the JSON of the regions into the elf?
A: It's actually not strictly required, as thememoryLayout.pytool is able to draw from both elf and map. However, it is one more option:
Instead of needing both the elf and the map (often very large and not always available) you can only transport the elf containing the required information.
"enriched" elf have also been included in the repository.
Its purpose is to extract and print the information on the layout of the various memory regions.
$ python3 memoryLayout.py --help
usage: memoryLayout.py [--help] [-v] [-ro] [-p] [-dr REG] [-h]
elffile [mapfile]
positional arguments:
elffile input elf file
mapfile input map file (shoud be unused)
optional arguments:
--help show this help message and exit
-v, --verbose print some message
-ro, --extract-rodata
unbundle .rodata infos
-p, --percentages print percentages
-dr REG, --debug-region REG
some debug prints about REG memory region
-h, --human-readable print human readable values
It tries to extract the information from the elf, in the .memory_configuration
section it expects to find the JSON description of the memory regions.
Alternatively it needs the map file
$ python3 memoryLayout.py evkbimxrt1050_sai_interrupt_transfer_link-to-ram_and_Region.elf
Memory region .text .data .bss LoadMap Total
BOARD_FLASH: 0 B 0 B 0 B 0 B 0 B
SRAM_ITC: 83356 B 0 B 0 B 28 B 83384 B
SRAM_DTC: 0 B 28 B 8768 B 0 B 8796 B
SRAM_OC: 0 B 0 B 0 B 0 B 0 B
BOARD_SDRAM: 0 B 0 B 0 B 0 B 0 B
$ python3 memoryLayout.py -ro evkbimxrt1050_sai_interrupt_transfer_flash.axf evkbimxrt1050_sai_interrupt_transfer_flash.map
Memory region .text .rodata .data .bss LoadMap Total
BOARD_FLASH: 83360 B 8192 B 0 B 0 B 28 B 91580 B
SRAM_DTC: 0 B 0 B 28 B 8768 B 0 B 8796 B
SRAM_ITC: 0 B 0 B 0 B 0 B 0 B 0 B
SRAM_OC: 0 B 0 B 0 B 0 B 0 B 0 B
BOARD_SDRAM: 0 B 0 B 0 B 0 B 0 B 0 B
The purpose of this tool is to retrieve from the .elf file the list of all symbols
and associate to them the source or object file that declare them. It can also indicate
the line of the source where the symbol has been declared (only if this information is
present in the .elf file) and tries to guess also the *fill* gaps.
$ python3 dissect.py --help
usage: dissect.py [-h] [-t {normal,csv}] [-o OUT] [-r REG] [-u] [-f] [-l] [-p PREFIX] elffile mapfile
positional arguments:
elffile input elf file
mapfile input map file
optional arguments:
-h, --help show this help message and exit
-t {normal,csv}, --type {normal,csv}
output type (default: normal)
-o OUT, --out OUT out file (default: stdout)
-r REG, --region REG memory region to dissect (default: all)
-u, --uniq filter symbols @address already populated
-f, --fill try to guess the *fill* fields
-l, --noline remove any line number from files
-p PREFIX, --prefix PREFIX
prefix for nm tool (e.g. arm-none-eabi-, default: "")
It integrates the information contained in the .elf file together with that of the
.map file to get the most specific details possible about the symbols.
For this reason it is mandatory to provide this tool with both .elf and .map.
This tool makes use of system tools such as grep, sed, tr, etc. To get the list
of symbols from .elf it uses nm possibly by specific architecture (using --prefix
parameter). The used nm tool is required to be in the PATH.
It can produce a human readable output or a csv to be imported by spreadsheets and be
able to filter, search or find the information we are looking for.
It may happen that several symbols have the same address and size (e.g. __attribute__((alias))).
Normally all symbols are listed, but this can be misleading when calculating cell sizes.
With the --uniq option only one of the symbols is listed.
Due to data types or alignments placed on memory sections, it may happen that there
are "gaps" between various symbols. In the .map file they are indicated with *fill*.
Using the --fill option you ask the tool to try to guess these gaps and list them.
$ python3 dissect.py --type=normal --uniq --prefix=arm-none-eabi- examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.axf examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map
Region addr(hex) addr(dec) size(dec) type symbol path
SRAM_ITC 0x00000000 0 672 T g_pfnVectors /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../startup/startup_mimxrt1052.c:414
SRAM_ITC 0x000002f0 752 76 T ResetISR /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../startup/startup_mimxrt1052.c:630
SRAM_ITC 0x0000033c 828 30 T data_init /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../startup/startup_mimxrt1052.c:596
SRAM_ITC 0x0000035a 858 18 T bss_init /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../startup/startup_mimxrt1052.c:605
SRAM_ITC 0x0000036c 876 2 W NMI_Handler /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../startup/startup_mimxrt1052.c:722
[...]
SRAM_DTC 0x20000120 536871200 4 b s_saiTxIsr /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_sai.c:109
SRAM_DTC 0x20000124 536871204 4 b s_saiRxIsr /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_sai.c:111
SRAM_DTC 0x20000128 536871208 112 b reg_cache /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../codec/fsl_wm8960.c:34
SRAM_DTC 0x20000198 536871320 180 B __Ciob /usr/local/mcuxpressoide-10.3.1_2233/ide/plugins/com.nxp.mcuxpresso.tools.linux_10.3.0.201811011841/tools/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/lib/thumb/v7e-m/fpv5/hard/libcr_semihost_nf.a(__ciob.o)
SRAM_DTC 0x2000024c 536871500 4 B __end_of_heap /usr/local/mcuxpressoide-10.3.1_2233/ide/plugins/com.nxp.mcuxpresso.tools.linux_10.3.0.201811011841/tools/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/lib/thumb/v7e-m/fpv5/hard/libcr_c.a(__init_alloc.o)
SRAM_DTC 0x20000250 536871504 4 B __heaps /usr/local/mcuxpressoide-10.3.1_2233/ide/plugins/com.nxp.mcuxpresso.tools.linux_10.3.0.201811011841/tools/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/lib/thumb/v7e-m/fpv5/hard/libcr_c.a(__init_alloc.o)
SRAM_DTC 0x20000254 536871508 4 B errno /usr/local/mcuxpressoide-10.3.1_2233/ide/plugins/com.nxp.mcuxpresso.tools.linux_10.3.0.201811011841/tools/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/lib/thumb/v7e-m/fpv5/hard/libcr_c.a(errno.o)
SRAM_DTC 0x20000258 536871512 1 b isFinished /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../source_transfer/sai_interrupt_transfer.c:59
python3 dissect.py --type=normal --fill --prefix=arm-none-eabi- examples/evkbimxrt1050_sai_interrupt_transfer_flash.axf examples/evkbimxrt1050_sai_interrupt_transfer_flash.map
Region addr(hex) addr(dec) size(dec) type symbol path
SRAM_DTC 0x20000000 536870912 4 D SystemCoreClock /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../device/system_MIMXRT1052.c:67
SRAM_DTC 0x20000004 536870916 24 D boardCodecConfig /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../board/board.c:22
SRAM_DTC 0x2000001c 536870940 28 b s_debugConsoleState /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../utilities/fsl_debug_console.c:194
SRAM_DTC 0x20000038 536870968 4 B g_serialHandle /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../utilities/fsl_debug_console.c:195
SRAM_DTC 0x2000003c 536870972 76 B txHandle /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../source_transfer/sai_interrupt_transfer.c:58
SRAM_DTC 0x20000088 536871048 24 B codecHandle /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../source_transfer/sai_interrupt_transfer.c:61
SRAM_DTC 0x200000a0 536871072 4 B g_xtalFreq /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_clock.c:51
SRAM_DTC 0x200000a4 536871076 4 B g_rtcXtalFreq /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_clock.c:53
SRAM_DTC 0x200000a8 536871080 4 b s_lpi2cMasterIsr /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_lpi2c.c:133
SRAM_DTC 0x200000ac 536871084 20 b s_lpi2cMasterHandle /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_lpi2c.c:136
[...]
BOARD_FLASH 0x6001558c 1610700172 36 t s_lpuartBases /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_lpuart.c:76
BOARD_FLASH 0x600155b0 1610700208 18 t s_lpuartClock /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_lpuart.c:88
BOARD_FLASH 0x600155c2 1610700226 1022 *fill*
BOARD_FLASH 0x600159c0 1610701248 16 t s_saiBases /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_sai.c:98
BOARD_FLASH 0x600159d0 1610701264 8 t s_saiTxIRQ /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_sai.c:102
BOARD_FLASH 0x600159d8 1610701272 8 t s_saiClock /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../drivers/fsl_sai.c:106
BOARD_FLASH 0x600159e0 1610701280 36 t s_LpuartAdapterBase /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../component/uart/lpuart_adapter.c:63
BOARD_FLASH 0x60015a04 1610701316 2524 *fill*
BOARD_FLASH 0x600163e0 1610703840 112 t wm8960_reg /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../codec/fsl_wm8960.c:27
BOARD_FLASH 0x60016450 1610703952 160 *fill*
BOARD_FLASH 0x600164f0 1610704112 8 T armPllConfig_BOARD_BootClockRUN /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../board/clock_config.c:142
BOARD_FLASH 0x600164f8 1610704120 20 T sysPllConfig_BOARD_BootClockRUN /home/max/Lavori/4202/wksp_test1/evkbimxrt1050_sai_interrupt_transfer/Debug/../board/clock_config.c:146
BOARD_FLASH 0x6001650c 1610704140 40 *fill*
BOARD_FLASH 0x60016534 1610704180 4 T __num_Ciob_streams /usr/local/mcuxpressoide-10.3.1_2233/ide/plugins/com.nxp.mcuxpresso.tools.linux_10.3.0.201811011841/tools/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/lib/thumb/v7e-m/fpv5/hard/libcr_semihost_nf.a(__ciob.o)
It may happen that if you add up the size of the symbols contained in a specific memory
region, the result may be a different number than the one indicated by the memoryLayout.py tool.
For example:
$ python3 dissect.py --type=normal --fill --uniq --region=BOARD_FLASH --prefix=arm-none-eabi- examples/evkbimxrt1050_sai_interrupt_transfer_flash.axf examples/evkbimxrt1050_sai_interrupt_transfer_flash.map | awk '{s+=$4} END {print s}'
91448
but memoryLayout.py says 91552 (.text + .rodata)
and again
$ python3 dissect.py --type=normal --fill --uniq --region=SRAM_DTC --prefix=arm-none-eabi- examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.axf examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map | awk '{s+=$4} END {print s}'
601
but memoryLayout.py says 8796 (.data + .bss)
This is because of some factors: *fill* gaps at the end of a region (to maintain alignment);
directives given in the linker script such as reserving space for heap and stack, that don't
correspond to any symbol.
In all the cases I analyzed, I was able to give an explanation.
If you find cases that you can't explain, please let me know, sending me also .elf and .map
and indicating the exact version of toolchain you used.
This tool simply lists the names of the memory regions. It can be useful in shell scripts.
$ python3 regions.py --helpusage: regions.py [-h] elffile [mapfile]
positional arguments:
elffile input elf file
mapfile input map file
optional arguments:
-h, --help show this help message and exit
$ python3 regions.py examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.axf examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map
BOARD_FLASH
SRAM_ITC
SRAM_DTC
SRAM_OC
BOARD_SDRAM
This experimental tool, similarly to dissect.py, calculates the allocation of symbols
in a specific region of memory, but unlike dissect.py it gives a graphical representation
in the form of a svg file.
$ python3 dissectSvg.py --help
usage: dissectSvg.py [-h] [-p PREFIX] elffile mapfile region output
positional arguments:
elffile input elf file
mapfile input map file
region memory region to dissect
output output file
optional arguments:
-h, --help show this help message and exit
-p PREFIX, --prefix PREFIX
prefix for nm tool (e.g. arm-none-eabi-, default: "")
$ python3 dissectSvg.py --prefix=arm-none-eabi- examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.axf examples/evkbimxrt1050_sai_interrupt_transfer_link-to-ram.map SRAM_ITC SRAM_ITC.svg
SRAM_ITC.svg is:
These tools were inspired by reading this post:
my hope is that someone (or myself) can take the work forward to create a tool that traces the memory occupation along the git commits (maybe even graphically)