tests/drivers/console: drivers.console.semihost can't work

[erwango]

Describe the bug
When running sanitycheck, drivers.console.semihost is run on all cortex-m boards.
Though, it is failed on all boards I could test (various STM32, frdm_k64f_reel_board)
When running with west, test doesn't output anything on console.

To Reproduce
Run test with sanitycheck, west

Expected behavior
Test runs successfully

Environment (please complete the following information):

• OS: Linux
• Toolchain (e.g Zephyr SDK, ...)
• Commit SHA or Version used

Additional context

[stephanosio]

While the test can run on real hardware targets, sanitycheck will not be able to validate its output, unless the semihosting console output is somehow redirected to the serial port to which sanitycheck is connected.

I will provide a fix for this.

[erwango]

@stephanosio Txs for the fix.

About this feature, is that complying will all cortex-m ?
I checked given link: https://developer.arm.com/docs/dui0471/k/what-is-semihosting/what-is-semihosting

And they mention: "ARM processors use the SVC instructions, formerly known as SWI instructions, to make semihosting calls. However, if you are compiling for an ARMv6-M or ARMv7-M, for example a Cortex-M1 or Cortex-M3 processor, semihosting is implemented using the BKPT instruction."

I don't see these cases in

zephyr/drivers/console/semihost_console.c

Line 14 in c2a77db

static int semihost_console_out(int ch)

[stephanosio]

About this feature, is that complying will all cortex-m ?
I checked given link: https://developer.arm.com/docs/dui0471/k/what-is-semihosting/what-is-semihosting

@erwango Yes, it works on all Cortex-M cores.

zephyr/drivers/console/semihost_console.c

Line 22 in c2a77db

"bkpt 0xab\n"

[erwango]

@stephanosio Txs for the confirmation!