[Gta04-owner] Issue 465: Problem with framebuffer memory allocation

[Belisko Marek]

Hi All,

issue with fb memory allocation is caused by unfuctional (removed)
kernel parameter vram which was removed (replaced by cma parameter) in
v3.8 (commit where removing of vram is described is
0049fb2603b7afb1080776ee691dfa5a3d282357). I did test where revert
commit : workaround for a problem that the framebuffer with 8 MB cant
be allocated;... and update u-boot bootargs :%s/vram=${vram}/cma=12M/g

Also need to enable CMA in menuconfig:
diff --git a/arch/arm/configs/gta04_defconfig b/arch/arm/configs/gta04_defconfig
index 77438c2..c4a14df 100644
--- a/arch/arm/configs/gta04_defconfig
+++ b/arch/arm/configs/gta04_defconfig
@@ -463,10 +463,12 @@ CONFIG_HIGHMEM=y
 CONFIG_FLATMEM=y
 CONFIG_FLAT_NODE_MEM_MAP=y
 CONFIG_HAVE_MEMBLOCK=y
+CONFIG_MEMORY_ISOLATION=y
 # CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
 CONFIG_PAGEFLAGS_EXTENDED=y
 CONFIG_SPLIT_PTLOCK_CPUS=4
 # CONFIG_COMPACTION is not set
+CONFIG_MIGRATION=y
 # CONFIG_PHYS_ADDR_T_64BIT is not set
 CONFIG_ZONE_DMA_FLAG=0
 CONFIG_BOUNCE=y
@@ -1014,7 +1016,19 @@ CONFIG_REGMAP=y
 CONFIG_REGMAP_I2C=y
 CONFIG_REGMAP_SPI=y
 CONFIG_DMA_SHARED_BUFFER=y
-# CONFIG_CMA is not set
+CONFIG_CMA=y
+# CONFIG_CMA_DEBUG is not set
+
+#
+# Default contiguous memory area size:
+#
+CONFIG_CMA_SIZE_MBYTES=16
+CONFIG_CMA_SIZE_SEL_MBYTES=y
+# CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set
+# CONFIG_CMA_SIZE_SEL_MIN is not set
+# CONFIG_CMA_SIZE_SEL_MAX is not set
+CONFIG_CMA_ALIGNMENT=8
+CONFIG_CMA_AREAS=7

 #
 # Bus devices

with that updated configuration I cannot see problem with memory
allocation for framebuffer and framebuffer works fine.

Cheers,

marek

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Marek Belisko - OPEN-NANDRA
Freelance Developer

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