path: root/arch/arm/mach-uniphier/debug_ll.S
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authorMasahiro Yamada <>2015-09-22 00:27:36 +0900
committerMasahiro Yamada <>2015-09-25 00:27:53 +0900
commitfcbcd59730255018dbe78af9294598273a85a0de (patch)
tree6ca5a91bea033ed8545fa9566d765627bdb266ab /arch/arm/mach-uniphier/debug_ll.S
parent257b11f32d0ba451b8b7eba72f0db5e182d425dd (diff)
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 <>
Diffstat (limited to 'arch/arm/mach-uniphier/debug_ll.S')
0 files changed, 0 insertions, 0 deletions
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