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soc: esp32: Define __start as a C function

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The first stage bootloader, part of the ESP32 ROM, already sets up
a stack that's sufficient to execute C programs.  So, instead of
implementing __stack() in assembly, do it in C to simplify things
slightly.

This ESP32-specific initialization will perform the following:

  - Disable the watchdog timer that's enabled by the bootloader
  - Move exception handlers to IRAM
  - Disable normal interrupts
  - Disable the second CPU
  - Zero out the BSS segment

Things that might be performed in the future include setting up the
CPU frequency, memory protection regions, and enabling the flash
cache.

Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This commit is contained in:
Leandro Pereira 2017-06-13 10:48:38 -07:00 • committed by Anas Nashif
commit 0e08b946de
6 changed files with 78 additions and 6 deletions
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4
arch/xtensa/soc/esp32/linker.ld
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@ -191,10 +191,6 @@ SECTIONS
*(.dynamic)
*(.gnu.version_d)
. = ALIGN(4); /* this table MUST be 4-byte aligned */
_bss_table_start = ABSOLUTE(.);
LONG(_bss_start)
LONG(_bss_end)
_bss_table_end = ABSOLUTE(.);
_rodata_end = ABSOLUTE(.);
} GROUP_LINK_IN(RAMABLE_REGION)