Hi Oleksandr,
On 17/04/2019 15:59, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
This patch makes possible to use existing early prink code
for Renesas "Stout" board based on R-Car H2 SoC (SCIFA).
The "EARLY_PRINTK_VERSION" for that board should be 'A':
CONFIG_EARLY_PRINTK=scif,0xe6c40000,A
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
CC: Julien Grall <julien.gr...@arm.com>
---
Changes in v3:
- It was decided not to introduce new debug-scifa.inc
for handling SCIFA interface, but to extend existing
debug-scif.inc for handling both interfaces.
This patch is a result of splitting an initial patch
"xen/arm: Add SCIFA UART support for early printk"
and only adds a support.
Changes in v4:
- Drop SCIF(A) from comments
---
xen/arch/arm/arm32/debug-scif.inc | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/xen/arch/arm/arm32/debug-scif.inc
b/xen/arch/arm/arm32/debug-scif.inc
index a8d2eae..3f01c90 100644
--- a/xen/arch/arm/arm32/debug-scif.inc
+++ b/xen/arch/arm/arm32/debug-scif.inc
@@ -1,7 +1,7 @@
/*
* xen/arch/arm/arm32/debug-scif.inc
*
- * SCIF specific debug code
+ * SCIF(A) specific debug code
*
* Oleksandr Tyshchenko <oleksandr.tyshche...@globallogic.com>
* Copyright (C) 2014, Globallogic.
@@ -22,10 +22,13 @@
#ifdef EARLY_PRINTK_VERSION_NONE
#define STATUS_REG SCIF_SCFSR
#define TX_FIFO_REG SCIF_SCFTDR
+#elif EARLY_PRINTK_VERSION_A
+#define STATUS_REG SCIFA_SCASSR
+#define TX_FIFO_REG SCIFA_SCAFTDR
#endif
/*
- * SCIF UART wait UART to be ready to transmit
+ * Wait UART to be ready to transmit
This change and ...
* rb: register which contains the UART base address
* rc: scratch register
*/
@@ -37,7 +40,7 @@
.endm
/*
- * SCIF UART transmit character
+ * UART transmit character
... this one look like more a change for the previous than this one.
* rb: register which contains the UART base address
* rt: register which contains the character to transmit
*/
Cheers,
--
Julien Grall
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