Fix LPC11U35_401 baremetal build

[toyowata]

Summary of changes

The PR fix LPC11U35_401 baremetal build error and runtime error.
This should be now fixed: ARMmbed/mbed-os-example-blinky-baremetal#15

Documentation

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[x] Tests / results supplied as part of this PR

Greentea test does not work for this target (Mbed 2 only target).
So, I verified this fix as below:

$ git clone https://github.com/ARMmbed/mbed-os-example-blinky-baremetal
$ cd mbed-os-example-blinky-baremetal
$ echo 'https://github.com/toyowata/mbed/#f9242d0b5c8ecc3a20e5a1f9813c2c1d93c61db9' > mbed-os.lib
$ mbed deploy
$ mbed ls
[mbed] Working path "/Users/toywat01/test/nxp/mbed-os-example-blinky-baremetal" (program)
mbed-os-example-blinky-baremetal (#11e65bf06a7a)
`- mbed-os (#f9242d0b5c8e)
$ mbed compile -m lpc11u35_401 -t arm -f
$ mbed compile -m lpc11u35_401 -t gcc_arm -f

• It was compiled without error
• No crash at runtime
• LED1 blinks as expected timing

I also put printf message in the main.cpp for debug and it worked fine.

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Reviewers

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[mbed-ci]

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 1
Build artifacts

[adbridge]

@toyowata could you please fill in the test section? This is there so that we know how this is tested or whether new tests are required. Thanks.
I know you wrote 'Greentea test does not work for this target (Mbed 2 only target).' so my question would thus be, how is this changed verified as working ?
I'm going to hold back merging this until we know it has been verified properly...

[toyowata]

@adbridge I updated the test section of this PR. Can you please check?

[bulislaw]

Tickless doesn't work without RTOS...

[toyowata]

@bulislaw

I needed to add tickless-from-us-ticker to avoid runtime assertion here:

mbed-os/platform/source/mbed_os_timer.cpp

Line 55 in 6b89d16

MBED_ASSERT("OS timer not available - check MBED_CONF_TARGET_TICKLESS_FROM_US_TICKER" && false);

Any suggestion to avoid this assertion for the non-RTOS target?

[bulislaw]

Lets pull it in the next patch. Low risk of breaking something.

[hugueskamba]

@toyowata
How did we come up with 0x400?

[toyowata]

How did we come up with 0x400?

It is from linker script file.

mbed-os/targets/TARGET_NXP/TARGET_LPC11UXX/device/TOOLCHAIN_ARM_STD/TARGET_LPC11U35_401/LPC11U35.sct

Line 4 in 9243abb

#define MBED_BOOT_STACK_SIZE 0x400

[hugueskamba]

Ah OK. Thanks.