From 99832196114c7e9451aa79d8cd0eb033cd833c20 Mon Sep 17 00:00:00 2001
From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: Fri, 27 Dec 2024 13:23:39 +0000
Subject: [PATCH] lm32: Initial LatticeMicro32 support

This target is in GCC/binutils for a while.

It's baremetal only without upstream Linux support.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 config/arch/lm32.in                       | 10 ++++++++++
 config/kernel/linux.in                    |  2 +-
 samples/lm32-unknown-elf/crosstool.config |  6 ++++++
 samples/lm32-unknown-elf/reported.by      |  3 +++
 scripts/build/arch/lm32.sh                |  6 ++++++
 5 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 config/arch/lm32.in
 create mode 100644 samples/lm32-unknown-elf/crosstool.config
 create mode 100644 samples/lm32-unknown-elf/reported.by
 create mode 100644 scripts/build/arch/lm32.sh

diff --git a/config/arch/lm32.in b/config/arch/lm32.in
new file mode 100644
index 00000000..a2ae3b2d
--- /dev/null
+++ b/config/arch/lm32.in
@@ -0,0 +1,10 @@
+# LatticeMico32 soft-core architecture
+
+## no-package
+## select ARCH_SUPPORTS_32
+## select ARCH_DEFAULT_32
+## select ARCH_DEFAULT_BE
+## depends on EXPERIMENTAL
+
+## help The LatticeMico32 soft-core architecture:
+## help     https://www.latticesemi.com/en/Products/DesignSoftwareAndIP/IntellectualProperty/IPCore/IPCores02/LatticeMico32.aspx
diff --git a/config/kernel/linux.in b/config/kernel/linux.in
index 0f85ff89..6e929c23 100644
--- a/config/kernel/linux.in
+++ b/config/kernel/linux.in
@@ -1,6 +1,6 @@
 # Linux kernel options
 
-## depends on !ARCH_AVR && !ARCH_MSP430 && !ARCH_MOXIE && !ARCH_PRU
+## depends on !ARCH_AVR && !ARCH_LM32 && !ARCH_MSP430 && !ARCH_MOXIE && !ARCH_PRU
 ## select KERNEL_SUPPORTS_SHARED_LIBS
 
 ## help Build a toolchain targeting systems running Linux as a kernel.
diff --git a/samples/lm32-unknown-elf/crosstool.config b/samples/lm32-unknown-elf/crosstool.config
new file mode 100644
index 00000000..68915de2
--- /dev/null
+++ b/samples/lm32-unknown-elf/crosstool.config
@@ -0,0 +1,6 @@
+CT_CONFIG_VERSION="4"
+CT_EXPERIMENTAL=y
+CT_ARCH_LM32=y
+CT_CC_LANG_CXX=y
+CT_DEBUG_GDB=y
+# CT_GDB_CROSS_PYTHON is not set
diff --git a/samples/lm32-unknown-elf/reported.by b/samples/lm32-unknown-elf/reported.by
new file mode 100644
index 00000000..500de2cd
--- /dev/null
+++ b/samples/lm32-unknown-elf/reported.by
@@ -0,0 +1,3 @@
+reporter_name="Jiaxun Yang <jiaxun.yang@flygoat.com>"
+reporter_url="https://flygoat.com/"
+reporter_comment="Example for building a toolchain for LM32 bare metal targets"
diff --git a/scripts/build/arch/lm32.sh b/scripts/build/arch/lm32.sh
new file mode 100644
index 00000000..77e7c2cb
--- /dev/null
+++ b/scripts/build/arch/lm32.sh
@@ -0,0 +1,6 @@
+# Compute LM32-specific values
+
+CT_DoArchTupleValues() {
+    # Do nothing here. Default values are sane.
+    :;
+}