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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-09-21 15:27:36 (GMT) |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2015-09-24 15:27:53 (GMT) |
| commit | fcbcd59730255018dbe78af9294598273a85a0de (patch) | |
| tree | 6ca5a91bea033ed8545fa9566d765627bdb266ab /arch/arm/mach-uniphier/ph1-sld3 | |
| parent | 257b11f32d0ba451b8b7eba72f0db5e182d425dd (diff) | |
| download | u-boot-fcbcd59730255018dbe78af9294598273a85a0de.tar.xz | |
ARM: uniphier: fix glitch signal problem for low-level debug
Currently, IECTRL is enabled after pin-mux settings for the low-level
debugging for PH1-LD4 and PH1-sLD8. While IECTRL is disabled, input
signals are pulled-down, i.e. glitch signal (Low to High transition)
problem occurs if pin-mux is set up first. As a result, one invalid
character is input to the UART block and the auto-boot counting is
terminated immediately.
The correct initialization procedure is:
[1] Enable IECTRL (if IECTRL exists for the pins)
[2] Set up pin-muxing
[3] Deassert the reset of the hardware block
Currently, the low-level debugging is working for PH1-sLD3 and
PH1-Pro4, but just in case, follow the sequence for all the SoCs.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/arm/mach-uniphier/ph1-sld3')
| -rw-r--r-- | arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S b/arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S index ee2eae6..f4eccb4 100644 --- a/arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S +++ b/arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S @@ -15,6 +15,9 @@ #include <mach/debug-uart.S> ENTRY(setup_lowlevel_debug) + sg_set_pinsel 63, 0, 4, 4, r0, r1 + sg_set_pinsel 64, 1, 4, 4, r0, r1 + ldr r0, =BCSCR5 ldr r1, =0x24440000 str r1, [r0] @@ -26,8 +29,5 @@ ENTRY(setup_lowlevel_debug) init_debug_uart r0, r1, r2 - sg_set_pinsel 63, 0, 4, 4, r0, r1 - sg_set_pinsel 64, 1, 4, 4, r0, r1 - mov pc, lr ENDPROC(setup_lowlevel_debug) |