From 3a55ef6cf7f70c758c7ae9943de14b02f6dac6be Mon Sep 17 00:00:00 2001 From: Lars Rasmusson Date: Thu, 17 Jan 2013 16:48:22 +0000 Subject: xen: arm: Correct register values and comment in early init_uart. Set register values and comment in early init_uart to match documentation of PL011 UART Reading the PL011 UART documentation on http://infocenter.arm.com/help/topic/com.arm.doc.ddi0183f/DDI0183.pdf in sec 3.2 shows the early initialisation of the UART on the Versatile Express is incorrect. This fixes it. Signed-off-by: Lars Rasmusson Acked-by: Ian Campbell Committed-by: Ian Campbell --- xen/arch/arm/arm32/head.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S index 4782f1131d..20e9da6228 100644 --- a/xen/arch/arm/arm32/head.S +++ b/xen/arch/arm/arm32/head.S @@ -352,11 +352,11 @@ fail: PRINT("- Boot failed -\r\n") * Clobbers r0-r2 */ init_uart: mov r1, #0x0 - str r1, [r11, #0x24] /* -> UARTIBRD (Baud divisor fraction) */ + str r1, [r11, #0x28] /* -> UARTFBRD (Baud divisor fraction) */ mov r1, #0x4 /* 7.3728MHz / 0x4 == 16 * 115200 */ str r1, [r11, #0x24] /* -> UARTIBRD (Baud divisor integer) */ mov r1, #0x60 /* 8n1 */ - str r1, [r11, #0x24] /* -> UARTLCR_H (Line control) */ + str r1, [r11, #0x2C] /* -> UARTLCR_H (Line control) */ ldr r1, =0x00000301 /* RXE | TXE | UARTEN */ str r1, [r11, #0x30] /* -> UARTCR (Control Register) */ adr r0, 1f -- cgit v1.2.3