micro-optimizations in startup assembly code

2024-04-14 04:08:13 +01:00
parent 394046a4b1
commit 8feb1d2ea8
2 changed files with 2 additions and 5 deletions
@@ -28,7 +28,7 @@ _start:
    la a0, RCC_BASE
    lw a1, (R32_RCC_RSTSCKR-RCC_BASE)(a0)
    slli a1, a1, (31 - 26)
-    bgez a1, _enter_application_code     // if PINRSTF == 0
+    bgez a1, _bootloader_limit      // if PINRSTF == 0

    // Enable BKP and PWR clock
    lw a1, (R32_RCC_APB1PCENR-RCC_BASE)(a0)
@@ -66,7 +66,6 @@ _start:
    // Delay done, clear systick and magic
    sw zero, (STK_CTLR-SYSTICK_BASE)(a0)
    sw zero, (STK_SR-SYSTICK_BASE)(a0)
-    sh zero, (a3)
    // If the delay expires, boot the application after all

 _enter_application_code_magic:
@@ -86,6 +85,7 @@ _enter_application_code:
    j _bootloader_limit

 _enter_bootloader:
+    sh zero, (a3)
    la gp, 0
    la sp, 0