From patchwork Wed Jun  8 13:49:26 2016
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Subject: [LEDE-DEV] cavium: Ignore MEM boot param when too small
From: =?utf-8?q?Micha=C5=82_Osowiecki?= <michal.osowiecki@gmail.com>
X-Patchwork-Id: 632273
Message-Id: <57582266.8020105@gmail.com>
To: lede-dev@lists.infradead.org
Date: Wed, 8 Jun 2016 15:49:26 +0200

Cisco RV0XX u-boot sets MEM=2048 as boot param. We assume that at least 
4MB (mem_alloc_size) of ram is needed to run linux on cavium boards, so 
if mem < 4M - ignore it and set default value


Signed-off-by: Michał Osowiecki <michal.osowiecki@gmail.com>

--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -944,6 +944,10 @@ void __init plat_mem_setup(void)
 	if (mem_alloc_size > MAX_MEMORY)
 		mem_alloc_size = MAX_MEMORY;
 
+	/* Ignore bootarg MEM <= 4MB - cisco uses a b0rked uboot env on their products */
+	if (MAX_MEMORY <= mem_alloc_size)
+		MAX_MEMORY = 512ull << 20;
+
 /* Crashkernel ignores bootmem list. It relies on mem=X@Y option */
 #ifdef CONFIG_CRASH_DUMP
 	add_memory_region(RESERVE_LOW_MEM, MAX_MEMORY, BOOT_MEM_RAM);