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Add routine to set the Raspberry Pi clock to 250MHz (loads faster than the default 19.2MHz).

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--HG--
branch : dtrg-videocore
rename : plat/rpi/libsys/pi_user_to_phys.s => plat/rpi/libsys/pi_fast_mode.s
This commit is contained in:
David Given
2013-06-24 23:57:27 +01:00
parent d94c1c8150
commit c72eaef8ee
4 changed files with 94 additions and 4 deletions
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15
plat/rpi/libsys/pi_uart.s
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@@ -14,9 +14,6 @@
! So be careful with your serial/terminal, some adjustment may be necessary.
TARGET_BAUD_RATE = 115200
! System clock is running directly off the 19.2MHz crystal at initial reset
SYSTEM_CLOCK = 19200000
GPFSEL1 = 0x7e200004
GPSET0 = 0x7e20001C
GPCLR0 = 0x7e200028
@@ -102,7 +99,10 @@ delay2:
st r0, (r1)
mov r1, #AUX_MU_BAUD_REG
mov r0, #[[SYSTEM_CLOCK/[TARGET_BAUD_RATE*8]]-1]
ld r0, _pi_clock_speed
mov r2, #TARGET_BAUD_RATE*8
divu r0, r0, r2
sub r0, #1
st r0, (r1)
mov r1, #AUX_MU_LCR_REG
@@ -176,3 +176,10 @@ recvwait:
b lr
.comm __uart_status, 1
.sect .data
.define _pi_clock_speed
! System clock is running directly off the 19.2MHz crystal at initial reset
_pi_clock_speed:
.data4 19200000