Thread sleepy end device configuration not able to fit in 320K flash, 48K ram

[maclobdell]

Bug

Target
NCS36510

Toolchain:
GCC_ARM - fails
ARM - pass
IAR - fails

mbed-cli version:
1.0.0

version
tag: mbed-os-5.4.1

Expected behavior
mbed-os-example-mesh-minimal with Thread sleep end device configuration should fit into 320K of flash and 48K of RAM. Just need to connect to parent. No need for routing.

Actual behavior
mbed-os-example-mesh minimal w/ Thread sleepy end device configuration results in a memory footprint that cannot always fit within NCS36510 single bank of flash (320K) and RAM (48K).

In the future, there will be 640K flash support, but this does not solve fitting it into the RAM.

Steps to reproduce

mbed compile -m NCS36510 -t GCC_ARM --profile mbed-os/tools/profiles/release.json

Result for GCC is that it does not fit into flash, even with release (small) profile.

Link: mbed-os-example-mesh-minimal_ncs36510
c:/program files (x86)/gnu tools arm embedded/4.9 2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld.exe: ./BUILD/NCS36510/GCC_ARM/mbed-os-example-mesh-minimal_ncs36510.elf sec
tion `.text' will not fit in region `FLASH'
c:/program files (x86)/gnu tools arm embedded/4.9 2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld.exe: region `FLASH' overflowed by 23776 bytes
collect2.exe: error: ld returned 1 exit status
[ERROR] c:/program files (x86)/gnu tools arm embedded/4.9 2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld.exe: ./BUILD/NCS36510/GCC_ARM/mbed-os-example-mesh-minimal_ncs36510
.elf section `.text' will not fit in region `FLASH'
c:/program files (x86)/gnu tools arm embedded/4.9 2015q2/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/bin/ld.exe: region `FLASH' overflowed by 23776 bytes
collect2.exe: error: ld returned 1 exit status

mbed compile -m NCS36510 -t IAR --profile mbed-os/tools/profiles/release.json

Result for IAR is that it does not fit into RAM

Link: mbed-os-example-mesh-minimal_ncs36510
Error[Lp011]: section placement failed
          unable to allocate space for sections/blocks with a total estimated
                    minimum size of 0xbffc bytes (max align 0x8) in
                    <[0x3fff4000-0x3fffffff]> (total uncommitted space 0xbe00).
[ERROR] Error[Lp011]: section placement failed
          unable to allocate space for sections/blocks with a total estimated
                    minimum size of 0xbffc bytes (max align 0x8) in
                    <[0x3fff4000-0x3fffffff]> (total uncommitted space 0xbe00).

mbed compile -m NCS36510 -t ARM --profile mbed-os/tools/profiles/release.json

Result for ARM compiler is successful build.

+-----------------------------+--------+-------+-------+
| Module                      |  .text | .data |  .bss |
+-----------------------------+--------+-------+-------+
| Misc                        | 146619 |   510 | 16673 |
| drivers                     |    912 |     4 |    28 |
| features/FEATURE_COMMON_PAL |  13182 |   179 |  8360 |
| features/filesystem         |    366 |     0 |     0 |
| features/mbedtls            | 127155 |   104 |  8836 |
| features/nanostack          |  11655 |   149 |  5200 |
| hal                         |    546 |    16 |     0 |
| platform                    |   1411 |    34 |   380 |
| rtos                        |    182 |     8 |     0 |
| rtos/rtx                    |   6766 |   100 |  8396 |
| targets/TARGET_ONSEMI       |   3937 |    60 |    84 |
| Subtotals                   | 312731 |  1164 | 47957 |
+-----------------------------+--------+-------+-------+
Allocated Heap: unknown
Allocated Stack: unknown
Total Static RAM memory (data + bss): 49121 bytes
Total RAM memory (data + bss + heap + stack): 49121 bytes
Total Flash memory (text + data + misc): 313895 bytes

Image: .\BUILD\NCS36510\ARM\mbed-os-example-mesh-minimal_ncs36510.bin

Config file (note the reduced mesh api heap size, yet it still fails to fit)

{
    "config": {
        "trace": {
        	"help": "options are true, false",
        	"value": true
        },
        "radio-type":{
            "help": "options are ATMEL, MCR20, NCS36510",
            "value": "NCS36510"
        },
        "mesh-type":{
            "help": "options are MESH_LOWPAN, MESH_THREAD",
            "value": "MESH_THREAD"
        }
    },
    "target_overrides": {
        "*": {
            "target.features_add": ["NANOSTACK", "THREAD_END_DEVICE", "COMMON_PAL"],
            "mbed-mesh-api.6lowpan-nd-panid-filter": "0xffff",            
            "mbed-mesh-api.6lowpan-nd-channel-page": 0,
            "mbed-mesh-api.6lowpan-nd-channel": 12,
            "mbed-mesh-api.6lowpan-nd-channel-mask": "(1<<12)",
            "mbed-mesh-api.thread-config-panid": "0x0700",
            "mbed-mesh-api.thread-master-key": "{0x10, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}",
            "mbed-mesh-api.thread-config-channel": 22,
            "mbed-mesh-api.thread-device-type": "MESH_DEVICE_TYPE_THREAD_SLEEPY_END_DEVICE",
            "mbed-mesh-api.heap-size": 4000,
            "mbed-trace.enable": false,
            "platform.stdio-convert-newlines": true,
            "platform.stdio-baud-rate": 115200
        }
    }
}

[maclobdell]

looks like the issue with fitting into the RAM when using IAR compiler is due to the relatively large default heap value that IAR uses. This can be fixed by updating \mbed-os\targets\TARGET_ONSEMI\TARGET_NCS36510\device\TOOLCHAIN_IAR\NCS36510.icf

define symbol __ICFEDIT_size_heap__   = 0x1400;

If this is fixed, and the 640K flash support is added for each toolchain. Then this issue can be closed. Although it would be nice to fit everything in to 320K flash, it is understandable that all the features provided take code space.