esp32: workaround esptool linker sections limit

[dcpleung]

When converting ELF to a flashable image, the esptool can only
process up to 16 ELF sections. Zephyr has been happily grouping
similar objects into linker sections which can easily go over
esptool's limit. This patch consolidates the kernel, net, log,
and shell objects into their own sections.

Also remove the app_noinit section as no one is emitting
anything into that section, and it's not being used by other
arch/SoC/boards in Zephyr.

Fixes #20980

Signed-off-by: Daniel Leung [email protected]

[mahavirj]

@dcpleung Probably this change breaks something in symbol placement, following test code which was otherwise functional was found to broken:

diff --git samples/hello_world/prj.conf samples/hello_world/prj.conf
index b2a4ba5910..a7dbfcaf98 100644
--- samples/hello_world/prj.conf
+++ samples/hello_world/prj.conf
@@ -1 +1,3 @@
 # nothing here
+CONFIG_HEAP_MEM_POOL_SIZE=65536
+CONFIG_HEAP_MEM_POOL_MIN_SIZE=32768
diff --git samples/hello_world/src/main.c samples/hello_world/src/main.c
index 6c5c8a27dc..3a2c6d3bdd 100644
--- samples/hello_world/src/main.c
+++ samples/hello_world/src/main.c
@@ -9,5 +9,6 @@
 
 void main(void)
 {
-       printk("Hello World! %s\n", CONFIG_BOARD);
+       volatile int *ptr = k_malloc(512);
+       printk("Hello World! %s %p\n", CONFIG_BOARD, ptr);
 }

Please have a look once.

Thanks.

[dcpleung]

Uploaded a new version. This should fix the issue.

[mahavirj]

Uploaded a new version. This should fix the issue.

Verified, it fixed the issue. Thanks.

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[chrta]

I am no specialist here, but i was able to flash and run simple sample applications on the esp32.