--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bsp/oldint.S	Thu Jun 09 00:02:41 2016 +0000
@@ -0,0 +1,70 @@
+/*
+ * This module contains that part of TI's int.s (INT_Initialize) code
+ * which does some entry-point initialization of a few Calypso registers.
+ * The important part for us is getting rid of whatever PLL setup
+ * may have been done by the BootROM-based process that got us loaded
+ * and running - we need to do that before we can do our own setup.
+ */
+
+	.code 32
+	.text
+
+#define	CNTL_ARM_CLK_REG	0xFFFFFD00  // CNTL_ARM_CLK register address
+#define	DPLL_CNTRL_REG		0xFFFF9800  // DPLL control register address
+#define	EXTRA_CONTROL_REG	0xFFFFFB10  // Extra Control register CONF addr
+#define	MPU_CTL_REG		0xFFFFFF08  // MPU_CTL register address
+
+#define	CNTL_ARM_CLK_RST	0x1081      // Init of CNTL_ARM_CLK register
+
+                                            // Use DPLL, Divide by 1
+#define	DPLL_CONTROL_RST	0x2002      // Configure DPLL in default state
+#define	DISABLE_DU_MASK		0x0800      // Mask to Disable the DU module
+#define	ENABLE_DU_MASK		0xF7FF      // Mask to Enable the DU module
+#define	MPU_CTL_RST		0x0000      // Reset value of MPU_CTL register
+					    // - All protections disabled
+
+	.globl	freecalypso_disable_bootrom_pll
+freecalypso_disable_bootrom_pll:
+@
+@  Configure DPLL register with reset value
+@
+       ldr     r1,=DPLL_CNTRL_REG    @ Load address of DPLL register in R1
+       ldrh    r2,=DPLL_CONTROL_RST  @ Load DPLL reset value in R2
+       strh    r2,[r1]               @ Store DPLL reset value in DPLL register
+
+@
+@  Wait that DPLL goes in BYPASS mode
+@
+Wait_DPLL_Bypass:
+       ldr     r2,[r1]               @ Load DPLL register
+       and     r2,r2,#1              @ Perform a mask on bit 0
+       cmp     r2,#1                 @ Compare DPLL lock bit
+       beq     Wait_DPLL_Bypass      @ Wait Bypass mode (i.e. bit[0]='0')
+
+@
+@  Configure CNTL_ARM_CLK register with reset value: DPLL is used to
+@  generate ARM clock with division factor of 1.
+@
+       ldr     r1,=CNTL_ARM_CLK_REG  @ Load address of CNTL_ARM_CLK register in R1
+       ldrh    r2,=CNTL_ARM_CLK_RST  @ Load CNTL_ARM_CLK reset value in R2
+       strh    r2,[r1]               @ Store CNTL_ARM_CLK reset value in CNTL_ARM_CLK register
+
+@
+@  Disable/Enable the DU module by setting/resetting bit 11 to '1'/'0'
+@
+       ldr     r1,=EXTRA_CONTROL_REG @ Load address of Extra Control register CONF
+@      ldrh    r2,=DISABLE_DU_MASK   @ Load mask to write in Extra Control register CONF
+       ldrh    r2,=ENABLE_DU_MASK    @ Load mask to write in Extra Control register CONF
+       ldrh    r0,[r1]               @ Load Extra Control register CONF in r0
+@      orr     r0,r0,r2              @ Disable DU module
+       and     r0,r0,r2              @ Enable DU module
+       strh    r0,[r1]               @ Store configuration in Extra Control register CONF
+
+@
+@  Disable all MPU protections
+@
+       ldr     r1,=MPU_CTL_REG       @ Load address of MPU_CTL register
+       ldrh    r2,=MPU_CTL_RST       @ Load reset value of MPU_CTL register
+       strh    r2,[r1]               @ Store reset value of MPU_CTL register
+
+	bx	lr