mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-11 13:46:17 +09:00
37d1023264
It was observed that when -DDEBUG is used to generate a debug build, U-Boot does not boot on MinnowMax board. A workaround is to disable CONFIG_DEBUG_UART. The real issue is that in order to have the debug uart to work, BayTrail SoC needs to be configured so that its internal uart is available to be used as the debug uart. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Stefan Roese <sr@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
/*
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* Copyright (C) 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/io.h>
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#define PCI_DEV_CONFIG(segbus, dev, fn) ( \
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(((segbus) & 0xfff) << 20) | \
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(((dev) & 0x1f) << 15) | \
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(((fn) & 0x07) << 12))
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/* Platform Controller Unit */
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#define LPC_DEV 0x1f
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#define LPC_FUNC 0
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/* Enable UART */
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#define UART_CONT 0x80
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/* SCORE Pad definitions */
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#define UART_RXD_PAD 82
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#define UART_TXD_PAD 83
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/* Pad base: PAD_CONF0[n]= PAD_BASE + 16 * n */
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#define GPSCORE_PAD_BASE (IO_BASE_ADDRESS + IO_BASE_OFFSET_GPSCORE)
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/* IO Memory */
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#define IO_BASE_ADDRESS 0xfed0c000
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#define IO_BASE_OFFSET_GPSCORE 0x0000
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#define IO_BASE_OFFSET_GPNCORE 0x1000
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#define IO_BASE_OFFSET_GPSSUS 0x2000
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#define IO_BASE_SIZE 0x4000
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static inline unsigned int score_pconf0(int pad_num)
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{
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return GPSCORE_PAD_BASE + pad_num * 16;
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}
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static void score_select_func(int pad, int func)
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{
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uint32_t reg;
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uint32_t pconf0_addr = score_pconf0(pad);
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reg = readl(pconf0_addr);
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reg &= ~0x7;
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reg |= func & 0x7;
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writel(reg, pconf0_addr);
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}
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static void x86_pci_write_config32(int dev, unsigned int where, u32 value)
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{
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unsigned long addr;
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addr = CONFIG_PCIE_ECAM_BASE | dev | (where & ~3);
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writel(value, addr);
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}
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/* This can be called after memory-mapped PCI is working */
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int setup_internal_uart(int enable)
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{
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/* Enable or disable the legacy UART hardware */
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x86_pci_write_config32(PCI_DEV_CONFIG(0, LPC_DEV, LPC_FUNC), UART_CONT,
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enable);
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/* All done for the disable part, so just return */
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if (!enable)
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return 0;
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/*
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* Set up the pads to the UART function. This allows the signals to
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* leave the chip
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*/
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score_select_func(UART_RXD_PAD, 1);
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score_select_func(UART_TXD_PAD, 1);
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/* TODO(sjg@chromium.org): Call debug_uart_init() */
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return 0;
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}
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void board_debug_uart_init(void)
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{
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setup_internal_uart(1);
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}
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