tests/posix/fs don't build on em_starterkit_em11d

[galak]

./scripts/sanitycheck -T tests/posix/fs -p em_starterkit_em11d

Gets:

JOBS: 64
Cleaning output directory /home/galak/git/zephyr/sanity-out
Building testcase defconfigs...
2 tests selected, 320 tests discarded due to filters
total complete:    0/   2   0%  failed:    0

em_starterkit_em11d       tests/posix/fs/portability.posix.newlib            FAILED: build_error
	see: sanity-out/em_starterkit_em11d/tests/posix/fs/portability.posix.newlib/build.log

total complete:    1/   2  50%  failed:    1

em_starterkit_em11d       tests/posix/fs/portability.posix                   FAILED: build_error
	see: sanity-out/em_starterkit_em11d/tests/posix/fs/portability.posix/build.log

total complete:    2/   2  100%  failed:    2
0 of 2 tests passed with 0 warnings in 3 seconds

[galak]

We can easily exclude this board, but it seems like the configuration with its build about what we think is "FLASH" and what we think is "SRAM" might not be right.

Memory region         Used Size  Region Size  %age Used
            ICCM:          0 GB        64 KB      0.00%
            SRAM:      141532 B       128 KB    107.98%
            DCCM:          0 GB        64 KB      0.00%
        IDT_LIST:          57 B         2 KB      2.78/opt/zephyr-sdk-0.10.0/arc-zephyr-elf/bin/../lib/gcc/arc-zephyr-elf/8.3.0/../../../../arc-zephyr-elf/bin/ld: zephyr_prebuilt.elf section `noinit' will not fit in region `SRAM'
/opt/zephyr-sdk-0.10.0/arc-zephyr-elf/bin/../lib/gcc/arc-zephyr-elf/8.3.0/../../../../arc-zephyr-elf/bin/ld: region `SRAM' overflowed by 10460 bytes
collect2: error: ld returned 1 exit status

[galak]

I'm not clear which memory on the em11d we expect to be running out of. The dts seems to imply DDR. zephyr,sram = &ddr0; But I think the linker scripts have a different idea.

[ruuddw]

This is related to PR #14811.
Somewhere a /1024 is applied in the dts magic, and emsk linker script does additional /1024, resulting in 128k instead of 128M memory size.

Generated dts section:
/* memory@10000000 */ #define DT_MMIO_SRAM_0 1 #define DT_MMIO_SRAM_10000000_BASE_ADDRESS 0x10000000 #define DT_MMIO_SRAM_10000000_SIZE 134217728 #define DT_SRAM_BASE_ADDRESS 0x10000000 #define DT_SRAM_SIZE 131072 #define DT_MMIO_SRAM_0_BASE_ADDRESS DT_SRAM_BASE_ADDRESS #define DT_MMIO_SRAM_0_SIZE DT_SRAM_SIZE

Any idea why the DT_SRAM_SIZE is 131072 instead of 134217728?
Something to fix in dts, or in the emsk linker script?

[galak]

The linker script needs fixing. We've always scaled DT_SRAM_SIZE by 1024 in Zephyr. I want to change that, but haven't gotten around to cleaning it up.