• Paul Burton's avatar
    mips_malta: support up to 2GiB RAM · 94c2b6af
    Paul Burton authored
    A Malta board can support up to 2GiB of RAM. Since the unmapped kseg0/1
    regions are only 512MiB large & the latter 256MiB of those are taken up
    by the IO region, access to RAM beyond 256MiB must be done through a
    mapped region. In the case of a Linux guest this means we need to use
    highmem.
    
    The mainline Linux kernel does not support highmem for Malta at this
    time, however this can be tested using the linux-mti-3.8 kernel branch
    available from:
    
      git://git.linux-mips.org/pub/scm/linux-mti.git
    
    
    
    You should be able to boot a Linux kernel built from the linux-mti-3.8
    branch, with CONFIG_HIGHMEM enabled, using 2GiB RAM by passing "-m 2G"
    to QEMU and appending the following kernel parameters:
    
      mem=256m@0x0 mem=256m@0x90000000 mem=1536m@0x20000000
    
    Note that the upper half of the physical address space of a Malta
    mirrors the lower half (hence the 2GiB limit) except that the IO region
    (0x10000000-0x1fffffff in the lower half) is not mirrored in the upper
    half. That is, physical addresses 0x90000000-0x9fffffff access RAM
    rather than the IO region, resulting in a physical address space
    resembling the following:
    
      0x00000000 -> 0x0fffffff  RAM
      0x10000000 -> 0x1fffffff  I/O
      0x20000000 -> 0x7fffffff  RAM
      0x80000000 -> 0x8fffffff  RAM (mirror of 0x00000000 -> 0x0fffffff)
      0x90000000 -> 0x9fffffff  RAM
      0xa0000000 -> 0xffffffff  RAM (mirror of 0x20000000 -> 0x7fffffff)
    
    The second mem parameter provided to the kernel above accesses the
    second 256MiB of RAM through the upper half of the physical address
    space, making use of the aliasing described above in order to avoid
    the IO region and use the whole 2GiB RAM.
    
    The memory setup may be seen as 'backwards' in this commit since the
    'real' memory is mapped in the upper half of the physical address space
    and the lower half contains the aliases. On real hardware it would be
    typical to see the upper half of the physical address space as the alias
    since the bus addresses generated match the lower half of the physical
    address space. However since the memory accessible in the upper half of
    the physical address space is uninterrupted by the IO region it is
    easiest to map the RAM as a whole there, and functionally it makes no
    difference to the target code.
    
    Due to the requirements of accessing the second 256MiB of RAM through
    a mapping to the upper half of the physical address space it is usual
    for the bootloader to indicate a maximum of 256MiB memory to a kernel.
    This allows kernels which do not support such access to boot on systems
    with more than 256MiB of RAM. It is also the behaviour assumed by Linux.
    QEMUs small generated bootloader is modified to provide this behaviour.
    Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
    Signed-off-by: default avatarYongbok Kim <yongbok.kim@imgtec.com>
    Reviewed-by: default avatarAurelien Jarno <aurelien@aurel32.net>
    Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>
    94c2b6af
mips_malta.c 37.8 KB