Printable View
I have a laptop with 4GB of RAM but only 3GB are seen by
my linux system. I'm currently using linux-2.6.29.1
I read somewhere that you could fix this even with 32-bit addressing
by setting CONFIG_X86_PAE while building the kernel
I ran
# grep 'PAE' /boot/config-2.6.29.1
and
# grep 'CONFIG_X86_' /boot/config-2.6.29.1
and none of these returned a string with PAE on it
Has it been renamed to something else? Or is it somewhere else?
The Linux kernel includes full PAE support starting with version 2.6,enabling access of up to 64 GB of memory on 32-bit machines. A PAE-enabled Linux-kernel requires that the CPU also support PAE
I guess you should check settings in BIOS, check how much memory your Graphics card take. well, that wont be 1GB for sure. ;)
yesterday I built latest kernel (2.6.29.2) and this time in
make menuconfig
instead of checking 'up to 4GB' I checked the '64GB'
After building and rebooting the 'free' command this time
displayed the correct total amount of RAM (4GB)
Some excerpts from my config
# Linux kernel version: 2.6.29.2
#
# CONFIG_64BIT is not set
CONFIG_X86_32=y
# CONFIG_X86_64 is not set
CONFIG_X86=y
CONFIG_ARCH_DEFCONFIG="arch/x86/configs/i386_defconfig"
#
CONFIG_MCORE2=y
# CONFIG_GENERIC_CPU is not set
CONFIG_X86_GENERIC=y
CONFIG_X86_CPU=y
...
#
CONFIG_X86_CMPXCHG64=y
...
# CONFIG_NOHIGHMEM is not set
# CONFIG_HIGHMEM4G is not set
CONFIG_HIGHMEM64G=y
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_HIGHMEM=y
CONFIG_X86_PAE=y
CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
...
CONFIG_PHYS_ADDR_T_64BIT=y