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https://github.com/brain-hackers/u-boot-brain
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![Faiz Abbas](/assets/img/avatar_default.png)
If UHS speed modes are enabled, a compatible SD card switches down to 1.8V during enumeration. If after this a software reboot/crash takes place and on-chip ROM tries to enumerate the SD card, the difference in IO voltages (host @ 3.3V and card @ 1.8V) may end up damaging the card. The fix for this is to have support for power cycling the card in hardware (with a PORz/soft-reset line causing a power cycle of the card). Because the beaglebone X15 (rev A,B and C), am57xx-evms and am57xx-idks don't have this capability, disable voltage switching for these boards. The major effect of this is that the maximum supported speed mode is now high speed(50 MHz) down from SDR104(200 MHz). Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
40 lines
1.0 KiB
Plaintext
40 lines
1.0 KiB
Plaintext
/*
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* Copyright (C) 2014-2016 Texas Instruments Incorporated - http://www.ti.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "am57xx-beagle-x15-common.dtsi"
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/ {
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model = "TI AM5728 BeagleBoard-X15 rev B1";
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};
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&tpd12s015 {
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gpios = <&gpio7 10 GPIO_ACTIVE_HIGH>, /* gpio7_10, CT CP HPD */
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<&gpio2 30 GPIO_ACTIVE_HIGH>, /* gpio2_30, LS OE */
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<&gpio7 12 GPIO_ACTIVE_HIGH>; /* gpio7_12/sp1_cs2, HPD */
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};
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&mmc1 {
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pinctrl-names = "default", "hs";
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pinctrl-0 = <&mmc1_pins_default>;
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pinctrl-1 = <&mmc1_pins_hs>;
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vmmc-supply = <&vdd_3v3>;
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vqmmc-supply = <&ldo1_reg>;
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};
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&mmc2 {
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pinctrl-names = "default", "hs", "ddr_1_8v";
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pinctrl-0 = <&mmc2_pins_default>;
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pinctrl-1 = <&mmc2_pins_hs>;
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pinctrl-2 = <&mmc2_pins_ddr_3_3v_rev11 &mmc2_iodelay_ddr_3_3v_rev11_conf>;
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};
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/* errata i880 "Ethernet RGMII2 Limited to 10/100 Mbps" */
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&phy1 {
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max-speed = <100>;
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};
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