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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9e775ad19f
MSMs post 8x50 have 2Mb at the beginning of RAM reserved for shared memory. Since the kernel hasn't typically been told this RAM exists, PHYS_OFFSET has been set to 0xN0200000 and the memory atags passed to the kernel have matched. This doesn't play nicely with things such as AUTO_ZRELADDR, which doesn't work at all, and dynamic phys to virt, which requires an MSM specific workaround. Work around these issues by telling the kernel RAM starts at 0xN0000000 (it actually does) and fixup the atags from the bootloader (if necessary) to say the same. In addition, make sure to set TEXT_OFFSET at least 2Mb beyond the start of RAM so that the kernel doesn't end up being decompressed into shared memory. After doing this, AUTO_ZRELADDR should work on MSM with no problems and ARM_PATCH_PHYS_VIRT_16BIT should no longer be necessary. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Acked-by: David Brown <davidb@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
/* arch/arm/mach-msm/include/mach/memory.h
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*
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* Copyright (C) 2007 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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/* physical offset of RAM */
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#if defined(CONFIG_ARCH_QSD8X50) && defined(CONFIG_MSM_SOC_REV_A)
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#define PLAT_PHYS_OFFSET UL(0x00000000)
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#elif defined(CONFIG_ARCH_QSD8X50)
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#define PLAT_PHYS_OFFSET UL(0x20000000)
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#elif defined(CONFIG_ARCH_MSM7X30)
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#define PLAT_PHYS_OFFSET UL(0x00000000)
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#elif defined(CONFIG_ARCH_MSM8X60)
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#define PLAT_PHYS_OFFSET UL(0x40000000)
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#elif defined(CONFIG_ARCH_MSM8960)
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#define PLAT_PHYS_OFFSET UL(0x40000000)
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#else
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#define PLAT_PHYS_OFFSET UL(0x10000000)
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#endif
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#endif
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