The attached patch contains several fixes for the default hardware
startup.
[libgcc]
2015-09-21 James Bowman <james.bow...@ftdichip.com>
* config/ft32/crti-hw.S: Use __PMSIZE to allow configurable
memory layout. Deal correctly with BSS region larger than 32K.
Handle a watchdog reset like a power-on reset. Clean up unused
code.
Index: libgcc/config/ft32/crti-hw.S
===================================================================
--- libgcc/config/ft32/crti-hw.S (revision 227841)
+++ libgcc/config/ft32/crti-hw.S (working copy)
@@ -1,11 +1,8 @@
-.equ SYS_REGMSC0CFG_B3 , 0x1001b
-.equ SYS_REGIRQCTL_B3 , 0x100e3
-
.global _start
_start:
# START Interrupt Vector Table [[
- jmp 0x3fffc # RESET Vector
- jmp _watchdog_isr # WATCHDOG Vector # TODO: Change me to reset
the chip proper
+ jmp __PMSIZE-4
+ jmp watchdog_init
jmp interrupt_0
jmp interrupt_1
jmp interrupt_2
@@ -38,64 +35,66 @@ _start:
jmp interrupt_29
jmp interrupt_30
jmp interrupt_31
- jmp 0x3fff8
+ jmp __PMSIZE-8
# ]] END Interrupt Vector Table
codestart:
jmp init
-
.global _exithook
_exithook: # Debugger uses '_exithook' at 0x90 to catch program
exit
return
+watchdog_init:
+ ldk $r0,1
init:
+ ldk $sp,__RAMSIZE
# Disable all interrupts
- ldk $r0,0x80
- sta.b 0x100e3,$r0
-
- # Reset all peripherals
- # lda.l $r0, 0x10018
- # bins.l $r0, $r0, 0x23F # Set bit 31
- # sta.l 0x10018, $r0
+ ldk $r4,0x80
+ sta.b 0x100e3,$r4
# Initialize DATA by copying from program memory
- ldk.l $r0,__data_load_start
+ ldk.l $r4,__data_load_start
ldk.l $r1,__data_load_end
ldk.l $r2,0 # Will use __data after binutils patch
jmp .dscopy
.dsloop:
- # Copy PM[$r0] to RAM $r2
- lpmi.l $r3,$r0,0
+ # Copy PM[$r4] to RAM $r2
+ lpmi.l $r3,$r4,0
sti.l $r2,0,$r3
- add.l $r0,$r0,4
+ add.l $r4,$r4,4
add.l $r2,$r2,4
.dscopy:
- cmp.l $r0,$r1
+ cmp.l $r4,$r1
jmpc lt,.dsloop
# Zero BSS
- ldk.l $r0,_bss_start
+ ldk.l $r4,_bss_start
ldk.l $r2,_end
- sub.l $r2,$r2,$r0
+ sub.l $r2,$r2,$r4
ldk.l $r1,0
- memset.l $r0,$r1,$r2
+ ldk $r3,32764
+1:
+ cmp $r2,$r3
+ jmpc lt,2f
+ memset $r4,$r1,$r3
+ add $r4,$r4,$r3
+ sub $r2,$r2,$r3
+ jmp 1b
+2:
+ memset $r4,$r1,$r2
sub.l $sp,$sp,24 # Space for the caller argument frame
call main
-.equ EXITEXIT , 0x1fffc
+.equ EXITEXIT,0x1fffc
.global _exit
_exit:
sta.l EXITEXIT,$r0 # simulator end of test
jmp _exithook
-_watchdog_isr:
- ldk.l $sp, 0x80FFFF # Reset the stack pointer so it doesn't grow
to a huge size
- jmp 0
-
# Macro to construct the interrupt stub code.
# it just saves r0, loads r0 with the int vector
# and branches to interrupt_common.
