kingkevin
/
espressif_tinyusb
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Initialize MMU if we are executing from DDR

This commit is contained in:
Yunhao Tian 2021-12-08 13:39:27 +08:00
parent 43621ab9ed
commit 527036b1f5
1 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
hw/mcu/allwinner/f1c100s/machine/start.S
View File

@ -111,37 +111,38 @@ reset:
ldmia r0!, {r2-r8, r10} ldmia r0!, {r2-r8, r10}
stmia r1!, {r2-r8, r10} stmia r1!, {r2-r8, r10}
/* Initial system clock, ddr add uart */ /* Initial system clock, ddr and uart */
bl sys_clock_init bl sys_clock_init
bl sys_dram_init
bl sys_uart_init bl sys_uart_init
/* Boot speed up, leave slower sram */ /* Check if we are already running from dram */
adr r0, _start adr r0, _start
ldr r1, =_start ldr r1, =_start
cmp r0, r1 cmp r0, r1
beq _speedup beq _init_mmu
/* Init dram if not running from dram */
bl sys_dram_init
/* Copy bootloader to faster dram (sram is slower) */
ldr r0, =0x81f80000 ldr r0, =0x81f80000
adr r1, _start adr r1, _start
mov r2, #0x4000 mov r2, #0x4000
bl memcpy bl memcpy
ldr r0, =_speedup ldr r0, =_copy_self
ldr r1, =_start ldr r1, =_start
sub r0, r0, r1 sub r0, r0, r1
ldr r1, =0x81f80000 ldr r1, =0x81f80000
add r0, r0, r1 add r0, r0, r1
mov pc, r0 mov pc, r0
_speedup: _init_mmu:
nop bl sys_mmu_init
b 1f
_copy_self:
/* Copyself to link address */ /* Copyself to link address */
adr r0, _start
ldr r1, =_start
cmp r0, r1
beq 1f
bl sys_copyself bl sys_copyself
1: nop
1: nop
/* Initialize stacks */ /* Initialize stacks */
mrs r0, cpsr mrs r0, cpsr
bic r0, r0, #0x1f bic r0, r0, #0x1f