- /* Stack grows down from top of CAR */
- movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE), %esp
-
- /* Reserve space on stack for global data */
- subl $GENERATED_GBL_DATA_SIZE, %esp
-
- /* Align global data to 16-byte boundary */
- andl $0xfffffff0, %esp
-
- /* Zero the global data since it won't happen later */
- xorl %eax, %eax
- movl $GENERATED_GBL_DATA_SIZE, %ecx
- movl %esp, %edi
- rep stosb
-
- /* Setup first parameter to setup_gdt */
- movl %esp, %eax
-
- /* Reserve space for global descriptor table */
- subl $X86_GDT_SIZE, %esp
-
- /* Align temporary global descriptor table to 16-byte boundary */
- andl $0xfffffff0, %esp
+ /*
+ * Debug UART is available here although it may not be plumbed out
+ * to pins depending on the board. To use it:
+ *
+ * call debug_uart_init
+ * mov $'a', %eax
+ * call printch
+ */