tashaboot: console base from the devicetreeHEADmain

The uart address was the last board hardcode. The console
probe now walks the dtb for the pl011 node and reads its
first reg pair before the first print, the same walker the
gic lookup uses. The qemu default remains as the dev path
fallback for a tree without the node.

receipt: banner and every print on the dtb base, full boot to
the busybox shell, four cpus.

1 files changed, 17 insertions, 0 deletions

diff --git a/common/main.c b/common/main.c
index cb13ef1..b53c4b0 100644
--- a/common/main.c
+++ b/common/main.c
@@ -67,6 +67,23 @@ void tashaboot_main(uintptr_t fw_arg)
 	struct tb_image img;
 	int ret;
 
+	/*
+	 * the console uart the machine named, before the first
+	 * print. the base is the first reg pair of the pl011
+	 * node, the same walk the gic used, no board hardcodes.
+	 */
+	{
+		extern int tb_dtb_find_reg0(uintptr_t dtb,
+					    const char *name,
+					    uintptr_t *addr, size_t *size);
+		extern void tb_console_set_pl011(uintptr_t base);
+		uintptr_t uart = 0;
+		size_t usz = 0;
+
+		if (tb_dtb_find_reg0(fw_arg, "pl011", &uart, &usz) == 0)
+			tb_console_set_pl011(uart);
+	}
+
 	if (tb_console_init())
 		return;