Hello.
On 23-12-2011 1:01, Stephen Warren wrote:
On Tegra20, the UART clock runs at 216MHz, whereas on Tegra30 it runs at
408MHz. Modify arch_decomp_setup() to detect Tegra20-vs-Tegra30 at run-
time, and program the correct divisor.
This makes uncompressor messages work correctly on Tegra30. This also
fixes early printk, assuming zImage is used and this setup code runs.
Signed-off-by: Stephen Warren<[email protected]>
---
arch/arm/mach-tegra/include/mach/uncompress.h | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-tegra/include/mach/uncompress.h
b/arch/arm/mach-tegra/include/mach/uncompress.h
index 4e83237..61d6e08 100644
--- a/arch/arm/mach-tegra/include/mach/uncompress.h
+++ b/arch/arm/mach-tegra/include/mach/uncompress.h
[...]
@@ -45,15 +47,29 @@ static inline void flush(void)
static inline void arch_decomp_setup(void)
{
+ u8 *distctr = (u8 *)(TEGRA_ARM_INT_DIST_BASE +
+ GIC_DIST_CTR);
+ u32 ctlrs, div;
volatile u8 *uart = (volatile u8 *)TEGRA_DEBUG_UART_BASE;
int shift = 2;
if (uart == NULL)
return;
+ /*
+ * Tegra20 has 4 interrupt controllers
+ * Tegra30 has 5 interrupt controllers
+ * Future SoCs may need additional means of identification
+ */
+ ctlrs = (*distctr) & 0x1f;
() not necessary.
WBR, Sergei
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