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https://github.com/AsahiLinux/u-boot
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598a26a8fb
The dwmmc controllers on rk3188 do not have idma support, so need to use the fifo-mode and it my tests they became confused and stopped working if the frequency was to high. While I only tested in somewhat bigger steps, 32MHz for example hung the controller, while reducing it to 16MHz worked just fine and is reasonably fast to load a kernel from mmc. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
38 lines
493 B
Text
38 lines
493 B
Text
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Fuzhou Rockchip Electronics Co., Ltd.
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*/
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&cru {
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u-boot,dm-spl;
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};
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&pinctrl {
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u-boot,dm-spl;
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};
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&mmc0 {
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fifo-mode;
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max-frequency = <16000000>;
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};
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&mmc1 {
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fifo-mode;
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max-frequency = <16000000>;
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};
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&emmc {
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fifo-mode;
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max-frequency = <16000000>;
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};
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&uart2 {
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status = "okay";
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u-boot,dm-spl;
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};
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&timer3 {
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compatible = "rockchip,rk3368-timer", "rockchip,rk3288-timer";
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u-boot,dm-spl;
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clock-frequency = <24000000>;
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};
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