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Subject[PATCH] ARM: debug: msm: Support big-endian CPUs
If the CPU is in big-endian mode these macros will access the
hardware incorrectly. Reverse thins as necessary to fix this.

Signed-off-by: Stephen Boyd <>
arch/arm/include/debug/msm.S | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/arm/include/debug/msm.S b/arch/arm/include/debug/msm.S
index 9ef57612811d..e55a9426b496 100644
--- a/arch/arm/include/debug/msm.S
+++ b/arch/arm/include/debug/msm.S
@@ -23,6 +23,7 @@

.macro senduart, rd, rx
+ARM_BE8(rev \rd, \rd )
@ Write the 1 character to UARTDM_TF
str \rd, [\rx, #0x70]
@@ -35,24 +36,29 @@
@ check for TX_EMT in UARTDM_SR
ldr \rd, [\rx, #0x08]
+ARM_BE8(rev \rd, \rd )
tst \rd, #0x08
bne 1002f
@ wait for TXREADY in UARTDM_ISR
1001: ldr \rd, [\rx, #0x14]
+ARM_BE8(rev \rd, \rd )
tst \rd, #0x80
beq 1001b
@ Clear TX_READY by writing to the UARTDM_CR register
mov \rd, #0x300
+ARM_BE8(rev \rd, \rd )
str \rd, [\rx, #0x10]
@ Write 0x1 to NCF register
mov \rd, #0x1
+ARM_BE8(rev \rd, \rd )
str \rd, [\rx, #0x40]
@ UARTDM reg. Read to induce delay
ldr \rd, [\rx, #0x08]
@ wait for TX_READY
1001: ldr \rd, [\rx, #0x08]
+ARM_BE8(rev \rd, \rd )
tst \rd, #0x04
beq 1001b
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