eenurkka commented on code in PR #12353:
URL: https://github.com/apache/nuttx/pull/12353#discussion_r1601914481
##########
arch/arm64/src/imx9/imx9_boot.c:
##########
@@ -44,19 +44,39 @@
#include "imx9_gpio.h"
#include "imx9_lowputc.h"
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC 1700000000
+
/****************************************************************************
* Private Data
****************************************************************************/
+#ifdef CONFIG_IMX9_BOOTLOADER
+extern uint8_t _szbootloader[];
+#endif
+
static const struct arm_mmu_region g_mmu_regions[] =
{
- MMU_REGION_FLAT_ENTRY("DEVICE_REGION",
- CONFIG_DEVICEIO_BASEADDR, CONFIG_DEVICEIO_SIZE,
- MT_DEVICE_NGNRNE | MT_RW | MT_SECURE),
+ MMU_REGION_FLAT_ENTRY("DEVICE_REGION",
+ CONFIG_DEVICEIO_BASEADDR, CONFIG_DEVICEIO_SIZE,
+ MT_DEVICE_NGNRNE | MT_RW | MT_SECURE),
+
+ MMU_REGION_FLAT_ENTRY("DRAM0_S0",
+ CONFIG_RAMBANK1_ADDR, CONFIG_RAMBANK1_SIZE,
+ MT_NORMAL | MT_RW | MT_SECURE),
+#ifdef CONFIG_IMX9_BOOTLOADER
+ /* OCRAM secure region protection keeps the binary at RO mode,
+ * overriding any MMU settings. However, data and heap accesses
+ * beyond the binary require RW access.
+ */
- MMU_REGION_FLAT_ENTRY("DRAM0_S0",
- CONFIG_RAMBANK1_ADDR, CONFIG_RAMBANK1_SIZE,
- MT_NORMAL | MT_RW | MT_SECURE),
+ MMU_REGION_FLAT_ENTRY("BOOTLOADER",
+ (uint64_t)_stext, (uint64_t)_szbootloader,
+ MT_NORMAL | MT_RW | MT_SECURE),
Review Comment:
From start of code to end of RAM, _stext is thus ok; although could work
with _etext, but it's not aligned to save space;
00000000204c57ec T _etext
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