coreboot: rename from NeKernel firmware, refactor symbols to `cb_`, update docs

This patch completes a major renaming and cleanup of the firmware codebase:

- Rename project from "NeKernel Firmware" to "CoreBoot" in README and comments.
- Replace all `mp_`-prefixed symbols with `cb_` to reflect the new naming scheme.
- Remove obsolete SPECIFICATION.TXT and replace with SPECIFICATION_FIRMWARE.md.
- Update memory-mapped I/O helpers, TLB init, and platform-specific code to match `cb_*` naming.
- Refactor low-level UART, panic, PCI-tree, partition map, and context setup to use unified `cb_` API.
- Adjust linker scripts and boot vectors for ARM64, PPC64, and RV64 targets accordingly.
- Add Doxygen documentation note to README.

This change is part of an ongoing effort to rebrand and unify the firmware interface, improve naming clarity, and better align with platform-specific toolchains.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/arm64/script.lds b/src/arm64/script.lds
index 37bd647..b8a0d11 100644
--- a/src/arm64/script.lds
+++ b/src/arm64/script.lds
@@ -1,4 +1,4 @@
-ENTRY(mp_reset_vector)
+ENTRY(cb_reset_vector)
 SECTIONS
 {
   . = 0x40100000;
@@ -8,7 +8,7 @@ SECTIONS
   .bss : { *(.bss COMMON) }
   . = ALIGN(8);
   . = . + 0x1000; /* 4kB of stack memory */
-  __mp_stack_end = .;
+  __cb_stack_end = .;
 
-  PROVIDE(mp_memory_end = .);
+  PROVIDE(cb_memory_end = .);
 }