Nvukobrat/update common error docs (#109)

* Common failure resolution for SFPI build issues

* Ignore clangd cache dir

.gitignore

@@ -3,3 +3,4 @@ build
 third_party/tt-metal
 .DS_STORE
 .vscode/*
+.cache

docs/src/build.md

@@ -77,6 +77,14 @@ mdbook serve build/docs/book
 
 ## Dependencies
 
+### Ubuntu Common
+
+Make sure to have Git LFS installed. You can install it with the following command:
+
+```bash
+sudo apt-get install git-lfs
+```
+
 ### Ubuntu 22.04
 
 We need to install Ninja which can be done with the following command
@@ -155,3 +163,23 @@ CMake Error at CMakeLists.txt:2 (project):
 ```
 
 If you get the following error, it means you need to install clang which you can do with `sudo apt install clang` on Ubuntu.
+
+### `sfpi`, `trisc`, `ncrisc` build failure
+
+```
+pybuda/third_party/tt-mlir/third_party/tt-metal/src/tt-metal/tt_metal/third_party/sfpi/compiler/bin/riscv32-unknown-elf-g++: 1: version: not found
+pybuda/third_party/tt-mlir/third_party/tt-metal/src/tt-metal/tt_metal/third_party/sfpi/compiler/bin/riscv32-unknown-elf-g++: 2: oid: not found
+size: '1961632': No such file
+size: '1961632': No such file
+size: '1961632': No such file
+Always | FATAL | ncrisc build failed
+```
+
+If you got the above error, it means that SFPI or similar component build failed. First, make sure you have GIT LFS setup (e.g. sudo apt-get install git-lfs). Then, try to pull SFPI submodule manually:
+
+```bash
+cd third_party/tt-mlir/third_party/tt-metal/src/tt-metal
+git submodule foreach 'git lfs fetch --all && git lfs pull’
+```
+
+Then, try to build again.