From 18196fcf5f32219f0ec40ede42aea7e142f526d3 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Wed, 27 Mar 2013 15:40:36 +0100 Subject: [PATCH] cfa10036: Retrieve the RAM size at runtime The cfa-10036 comes in two flavours, with either 128MB or 256MB of RAM on it. Since it's not stored anywhere, we need to runtime detect it by introducing the cfa10036_get_ram_size function. Signed-off-by: Alexandre Belloni Acked-by: Maxime Ripard Signed-off-by: Sascha Hauer --- .../boards/crystalfontz-cfa10036/cfa10036.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c b/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c index 1bc20cf21..a37b0898e 100644 --- a/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c +++ b/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c @@ -90,9 +90,25 @@ static struct i2c_gpio_platform_data i2c_gpio_pdata = { .udelay = 5, /* ~100 kHz */ }; +void v5_mmu_cache_flush(void); +long cfa10036_get_ram_size(void) +{ + volatile u32 *base = (void *)IMX_MEMORY_BASE; + volatile u32 *ofs = base + SZ_128M / sizeof(u32); + + *base = *ofs = 0xdeadbeef; + *ofs = 0xbaadcafe; + + v5_mmu_cache_flush(); + if (*base == 0xbaadcafe) + return SZ_128M; + else + return SZ_256M; +} + static int cfa10036_mem_init(void) { - arm_add_mem_device("ram0", IMX_MEMORY_BASE, 128 * 1024 * 1024); + arm_add_mem_device("ram0", IMX_MEMORY_BASE, cfa10036_get_ram_size()); return 0; }