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https://github.com/smaeul/u-boot.git
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d96a782d09
The Amlogic Meson SoCs ROM supports a boot over USB with a custom protocol. When no other boot medium are available (or by forcing the USB mode), the ROM sets the primary USB port as device mode and waits for a Host to enumerate. When enumerated, a custom protocol described at [1] permits writing to memory and execute some specific FIP init code to run the loaded Arm Trusted Firmware BL2 and BL3 stages before running the BL33 stage. In this mode, we can load different binaries that can be used by U-boot like a script image file. This adds support for a custom USB boot stage only available when the boot mode is USB and the script file at a pre-defined address is valid. This support was heavily copied from the Sunxi Allwinner FEL U-Boot support. The tool pyamlboot described at [2], permits using this boot mode on boards exposing the first USB port, either as OTG or Host port. [1] https://github.com/superna9999/pyamlboot/blob/master/PROTOCOL.md [2] https://github.com/superna9999/pyamlboot/blob/master/README.md Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2018 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#ifndef __AXG_H__
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#define __AXG_H__
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#define AXG_AOBUS_BASE 0xff800000
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#define AXG_PERIPHS_BASE 0xff634400
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#define AXG_HIU_BASE 0xff63c000
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#define AXG_ETH_BASE 0xff3f0000
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/* Always-On Peripherals registers */
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#define AXG_AO_ADDR(off) (AXG_AOBUS_BASE + ((off) << 2))
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#define AXG_AO_SEC_GP_CFG0 AXG_AO_ADDR(0x90)
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#define AXG_AO_SEC_GP_CFG3 AXG_AO_ADDR(0x93)
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#define AXG_AO_SEC_GP_CFG4 AXG_AO_ADDR(0x94)
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#define AXG_AO_SEC_GP_CFG5 AXG_AO_ADDR(0x95)
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#define AXG_AO_BOOT_DEVICE 0xF
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#define AXG_AO_MEM_SIZE_MASK 0xFFFF0000
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#define AXG_AO_MEM_SIZE_SHIFT 16
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#define AXG_AO_BL31_RSVMEM_SIZE_MASK 0xFFFF0000
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#define AXG_AO_BL31_RSVMEM_SIZE_SHIFT 16
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#define AXG_AO_BL32_RSVMEM_SIZE_MASK 0xFFFF
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/* Peripherals registers */
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#define AXG_PERIPHS_ADDR(off) (AXG_PERIPHS_BASE + ((off) << 2))
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#define AXG_ETH_REG_0 AXG_PERIPHS_ADDR(0x50)
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#define AXG_ETH_REG_1 AXG_PERIPHS_ADDR(0x51)
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#define AXG_ETH_REG_0_PHY_INTF_RGMII BIT(0)
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#define AXG_ETH_REG_0_PHY_INTF_RMII BIT(2)
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#define AXG_ETH_REG_0_TX_PHASE(x) (((x) & 3) << 5)
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#define AXG_ETH_REG_0_TX_RATIO(x) (((x) & 7) << 7)
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#define AXG_ETH_REG_0_PHY_CLK_EN BIT(10)
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#define AXG_ETH_REG_0_INVERT_RMII_CLK BIT(11)
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#define AXG_ETH_REG_0_CLK_EN BIT(12)
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/* HIU registers */
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#define AXG_HIU_ADDR(off) (AXG_HIU_BASE + ((off) << 2))
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#define AXG_MEM_PD_REG_0 AXG_HIU_ADDR(0x40)
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/* Ethernet memory power domain */
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#define AXG_MEM_PD_REG_0_ETH_MASK (BIT(2) | BIT(3))
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#endif /* __AXG_H__ */
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