[U-Boot] Framebuffer support hangs kernel on mx53loco

[Fabio Estevam]

Hi Stefano/Anatolij,

When I activate framebuffer support for mx53loco board I face the
following problem (in about half of my attempts to boot the kernel):

Starting kernel ...

Linux version 2.6.35.3-01129-g691c08a (fabio at fabio-Latitude-E6410)
(gcc version 4.4.4 (4.4.4_09.06.2010) ) #5 PREEMPT Mon May 14 14:22:49
BRT 2012
CPU: ARMv7 Processor [412fc085] revision 5 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: Freescale MX53 LOCO Board
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 250880
Kernel command line: console=ttymxc0,115200 root=/dev/nfs ip=dhcp
nfsroot=10.29.240.143:,v3,tcp
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 480MB 512MB = 992MB total
Memory: 998528k/998528k available, 17280k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xf9e00000 - 0xffe00000   (  96 MB)
    vmalloc : 0xe0800000 - 0xf4000000   ( 312 MB)
    lowmem  : 0x80000000 - 0xe0000000   (1536 MB)
    pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
    modules : 0x7f000000 - 0x7fe00000   (  14 MB)
      .init : 0x80008000 - 0x80032000   ( 168 kB)
      .text : 0x80032000 - 0x807b4000   (7688 kB)
      .data : 0x807d0000 - 0x808234c0   ( 334 kB)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
        RCU-based detection of stalled CPUs is disabled.
        Verbose stalled-CPUs detection is disabled.
NR_IRQS:368
MXC GPIO hardware
MXC IRQ initialized
MXC_Early serial console at MMIO 0x53fbc000 (options '115200')
bootconsole [ttymxc0] enabled
Console: colour dummy device 80x30
Calibrating delay loop... 799.53 BogoMIPS (lpj=3997696)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
regulator: core version 0.5
NET: Registered protocol family 16
i.MX IRAM pool: 128 KB at 0xe0840000
IRAM READY
CPU is i.MX53 Revision 2.1

(system hangs here)

When framebuffer is not used I can succesfully reboot the board several times.

I know it is a difficult question, but in case you have any
ideas/suggestions I would be glad to listen to.

Regards,

Fabio Estevam