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From patchwork Wed Jun 8 13:49:26 2016
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
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Subject: [LEDE-DEV] cavium: Ignore MEM boot param when too small
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From: =?utf-8?q?Micha=C5=82_Osowiecki?= <michal.osowiecki@gmail.com>
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X-Patchwork-Id: 632273
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Message-Id: <57582266.8020105@gmail.com>
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To: lede-dev@lists.infradead.org
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Date: Wed, 8 Jun 2016 15:49:26 +0200
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Cisco RV0XX u-boot sets MEM=2048 as boot param. We assume that at least
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4MB (mem_alloc_size) of ram is needed to run linux on cavium boards, so
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if mem < 4M - ignore it and set default value
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Signed-off-by: Michał Osowiecki <michal.osowiecki@gmail.com>
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--- a/arch/mips/cavium-octeon/setup.c
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+++ b/arch/mips/cavium-octeon/setup.c
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@@ -944,6 +944,10 @@ void __init plat_mem_setup(void)
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if (mem_alloc_size > MAX_MEMORY)
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mem_alloc_size = MAX_MEMORY;
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+ /* Ignore bootarg MEM <= 4MB - cisco uses a b0rked uboot env on their products */
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+ if (MAX_MEMORY <= mem_alloc_size)
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+ MAX_MEMORY = 512ull << 20;
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+
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/* Crashkernel ignores bootmem list. It relies on mem=X@Y option */
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#ifdef CONFIG_CRASH_DUMP
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add_memory_region(RESERVE_LOW_MEM, MAX_MEMORY, BOOT_MEM_RAM);
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