commit e6965362328b88220647bb1b1e51b0410d8abf25
parent 605194f0e3891c5ac5441b2a9ac33760a92b633c
Author: Matsuda Kenji <info@mtkn.jp>
Date: Sun, 9 Apr 2023 08:53:53 +0900
try to read from flash without xip
Diffstat:
| M | mach.s | | | 28 | +++++++++++++++++++--------- |
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/mach.s b/mach.s
@@ -1,7 +1,7 @@
.section .text
.global init
init:
- push {lr}
+ push {r4, r5, r6, lr}
// unreset gpio and pll_sys and uart0
mov r1, #1
lsl r0, r1, #5 // io_bank0
@@ -119,18 +119,25 @@ pll_lock:
lsl r1, r1, #5
str r1, [r0, #0x2c] // UART0_UARTLCR_H
- mov r1, #8
- ldr r2, =0x20000000
-loop:
- ldr r0, [r2, #0]
+ mov r4, #16
+ mov r5, #0
+ ldr r6, xip_ssi_base
+read_loop:
+ str r5, [r6, #0x60] // SSI: DR0
+wait_ssi_loop:
+ ldr r1, [r6, #0x28] // SSI: SR
+ mov r2, #1
+ and r1, r2 // BUSY
+ bne wait_ssi_loop
+ ldr r0, [r6, #0x60] // SSI: DR0
bl printh
mov r0, #0x0A
bl putchar
- add r2, #4
- sub r1, #1
- bne loop
+ add r5, r5, #0x4
+ sub r4, #1
+ bne read_loop
- pop {pc}
+ pop {r4, r5, r6, pc}
unreset:
// unreset subsystems specified by r0
@@ -389,6 +396,9 @@ atomic_set:
atomic_clr:
.word 0x00003000
+xip_ssi_base:
+ .word 0x18000000
+
clocks_base:
.word 0x40008000
