riscv-elf.md: remove section on code models

Author: ebahapo

riscv-elf.md

@@ -10,7 +10,6 @@
 	* [ILP32E Calling Convention](#ilp32e-calling-convention)
 	* [Named ABIs](#named-abis)
 	* [Default ABIs](#default-abis)
-	* [Code models](#code-models)
 3. [C type details](#c-types)
 	* [C type sizes and alignments](#c-type-sizes)
 	* [C type representations](#c-type-representation)
@@ -321,41 +320,6 @@ default ABIs for specific architectures:
 
   * **on RV32G**: [ILP32D](#abi-ilp32d)
 
-## <a name=code-models /> Code models
-
-The RISC-V architecture constrains the addressing of positions in the
-address space.  There is no single instruction that can refer to an arbitrary 
-memory position using a literal as its argument.  Rather, instructions exist
-that, when combined together, can then be used to refer to a memory position
-via its literal.  And, when not, other data structures are used to help the
-code to address the memory space.  The coding conventions governing their use
-are known as code models.
-
-### Medium low
-
-The medium low code model, or `medlow`, allows the code to address the lower
-2 GiB of the address space.  By using the instruction `lui` and `ld` or `addi`
-instructions, for example, a 32-bit address literal can be produced.
-This code model is not position independent.
-
-### Medium any
-
-The medium any code model, or `medany`, allows the code to address the range
-between -2 GiB and +2 GiB from its position.  By using the instruction `auipc`
-and `st` or `addi` instructions, for example, a signed 32-bit offset, relative
-to the value of the `pc` register, can be produced.  This code model is
-position independent.
-
-### Compact
-
-The compact code model allows the code to address the whole 64-bit address space,
-especially when code and data are located far apart.  By using the Global
-Offset Table, or GOT, to hold the 64-bit address literals, any memory position
-can be referred.  By using the instructions `lui` and `addi`, a signed 32-bit
-offset, relative to the value of the `gp` register, can be produced, referring
-to address literals in the GOT.  This code model is position independent.
-Does not apply to the ILP32 ABIs.
-
 # <a name=c-types></a> C type details
 ## <a name=c-type-sizes></a> C type sizes and alignments