From mboxrd@z Thu Jan 1 00:00:00 1970 From: yrehan@gmail.com (Mian Yousaf Kaukab) Date: Sun, 29 Sep 2013 12:17:49 +0200 Subject: [PATCH] ARM: vexpress: ignore MIDR[0] for uart detection Message-ID: <1380449869-19911-1-git-send-email-yrehan@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Qemu vexpress-a9 target reports id of ARM Cortex-A9 core as r0p0 and uses legacy map. That is UART0 at address 0x10009000. Ignore MIDR[0] during uart detection so that r0p0 as well as r0p1 use legacy map. Signed-off-by: Mian Yousaf Kaukab --- arch/arm/include/debug/vexpress.S | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/debug/vexpress.S b/arch/arm/include/debug/vexpress.S index 524acd5..932db8b 100644 --- a/arch/arm/include/debug/vexpress.S +++ b/arch/arm/include/debug/vexpress.S @@ -27,11 +27,16 @@ @ Make an educated guess regarding the memory map: @ - the original A9 core tile (based on ARM Cortex-A9 r0p1) - @ should use UART at 0x10009000 + @ should use UART at 0x10009000. Moreover, qemu vexpress-a9 + @ target reports id of ARM Cortex-A9 core as r0p0 and uses + @ legacy map. @ - all other (RS1 complaint) tiles use UART mapped @ at 0x1c090000 mrc p15, 0, \rp, c0, c0, 0 - movw \rv, #0xc091 + mov \rv, #1 + @ Ignore MIDR[0] during comparison + bic \rp, \rp, \rv + movw \rv, #0xc090 movt \rv, #0x410f cmp \rp, \rv -- 1.8.1.2