Changeset ebb3538 in mainline for kernel/arch/arm64/src/mach/hikey960/hikey960.c

Timestamp:

2021-09-15T15:01:03Z (3 years ago)

Author:

Martin Decky <martin@…>

Branches:

master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

5ecac7e

Parents:

8ce56a6

Message:

Improve early kernel debugging prints

Since the early kernel debugging prints are useful only in a few
debugging scenarios, define a configuration option that disables them by
default (if enabled, it produces duplicate output which might be
confusing).

Implement early kernel debugging prints for the HiKey960.

File:

• kernel/arch/arm64/src/mach/hikey960/hikey960.c (modified) (2 diffs)

kernel/arch/arm64/src/mach/hikey960/hikey960.c

@@ -122 +122 @@
 }
 
+static void hikey960_early_uart_output(char32_t c)
+{
+        volatile uint32_t *uartdr = (volatile uint32_t *)
+            PA2KA(HIKEY960_UART_ADDRESS);
+        volatile uint32_t *uartfr = (volatile uint32_t *)
+            PA2KA(HIKEY960_UART_ADDRESS + 24);
+
+        while (*uartfr & 0x20U) {
+        }
+
+        *uartdr = c;
+}
+
 struct arm_machine_ops hikey960_machine_ops = {
         hikey960_init,
@@ -129 +142 @@
         hikey960_enable_vtimer_irq,
         hikey960_get_irq_count,
-        hikey960_get_platform_name
+        hikey960_get_platform_name,
+        hikey960_early_uart_output
 };