Accessing MBUS windows not backed-up by e.g. PCIe devices will hang the SoC. Disable MBUS error propagation back to CPU allows to read 0xffffffff instead of hanging the SoC.
Signed-off-by: Stefan Roese sr@denx.de Cc: Luka Perkov luka.perkov@sartura.hr --- v2: - Use clrsetbits_le32()
arch/arm/mach-mvebu/cpu.c | 3 +++ arch/arm/mach-mvebu/include/mach/soc.h | 3 +++ 2 files changed, 6 insertions(+)
diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c index 23c2a97..fa82067 100644 --- a/arch/arm/mach-mvebu/cpu.c +++ b/arch/arm/mach-mvebu/cpu.c @@ -241,6 +241,9 @@ int arch_cpu_init(void) */ mvebu_mbus_probe(windows, ARRAY_SIZE(windows));
+ /* Disable MBUS error propagation */ + clrsetbits_le32(SOC_COHERENCY_FABRIC_CTRL_REG, MBUS_ERR_PROP_EN, 0); + return 0; } #endif /* CONFIG_ARCH_CPU_INIT */ diff --git a/arch/arm/mach-mvebu/include/mach/soc.h b/arch/arm/mach-mvebu/include/mach/soc.h index 71254c5..a29e5dc 100644 --- a/arch/arm/mach-mvebu/include/mach/soc.h +++ b/arch/arm/mach-mvebu/include/mach/soc.h @@ -66,6 +66,9 @@ #define MVEBU_SATA0_BASE (MVEBU_REGISTER(0xa8000)) #define MVEBU_SDIO_BASE (MVEBU_REGISTER(0xd8000))
+#define SOC_COHERENCY_FABRIC_CTRL_REG (MVEBU_REGISTER(0x20200)) +#define MBUS_ERR_PROP_EN (1 << 8) + #define MBUS_BRIDGE_WIN_CTRL_REG (MVEBU_REGISTER(0x20250)) #define MBUS_BRIDGE_WIN_BASE_REG (MVEBU_REGISTER(0x20254))