On 5/14/2012 10:27 AM, Fabio Estevam wrote:

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@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@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 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot

This patch (though you can't apply it directly) may give you a clue.

Author: Troy Kisky troy.kisky@boundarydevices.com Date: Tue Jan 24 14:46:29 2012 -0700

squash with dont_sleep, fix non-lvds boot

diff --git a/arch/arm/mach-mx5/clock.c b/arch/arm/mach-mx5/clock.c index faecc34..efe324c 100644 --- a/arch/arm/mach-mx5/clock.c +++ b/arch/arm/mach-mx5/clock.c @@ -4581,6 +4581,19 @@ static void clk_tree_init(void) } }

+#define IPU_CONF 0x000 +#define IPU_DISP_GEN 0x0C4 + +void turn_off_display(int physical_base) { + void __iomem *ipuc = ioremap(physical_base, SZ_4K); + if (ipuc) { + /* clear DI0/DI1 counter release */ + unsigned reg = __raw_readl(ipuc + IPU_DISP_GEN); + __raw_writel(reg & ~(3 << 24), ipuc + IPU_DISP_GEN); + __raw_writel(0, ipuc + IPU_CONF); + iounmap(ipuc); + } +}

int __init mx51_clocks_init(unsigned long ckil, unsigned long osc, unsigned long ckih1, unsigned long ckih2) { @@ -4590,6 +4603,7 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc, unsigned long int wp_cnt = 0; u32 pll1_rate;

+ turn_off_display(MX51_IPU_CTRL_BASE_ADDR + ((512 - 32) << 20)); pll1_base = ioremap(PLL1_BASE_ADDR, SZ_4K); pll2_base = ioremap(PLL2_BASE_ADDR, SZ_4K); pll3_base = ioremap(PLL3_BASE_ADDR, SZ_4K); @@ -4622,9 +4636,7 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc, unsigned long __raw_writel(0, MXC_CCM_CCGR3); __raw_writel(1 << MXC_CCM_CCGRx_CG8_OFFSET, MXC_CCM_CCGR4);

- /* if ipu enabled, leave enabled, else sleep handshake will fail */ - reg = __raw_readl(MXC_CCM_CCGR5) & (3 << MXC_CCM_CCGRx_CG5_OFFSET); - __raw_writel(reg | 1 << MXC_CCM_CCGRx_CG2_OFFSET | + __raw_writel(1 << MXC_CCM_CCGRx_CG2_OFFSET | 1 << MXC_CCM_CCGR5_CG6_1_OFFSET | 1 << MXC_CCM_CCGR5_CG6_2_OFFSET | 3 << MXC_CCM_CCGRx_CG7_OFFSET | @@ -4910,6 +4922,8 @@ int __init mx53_clocks_init(unsigned long ckil, unsigned long osc, unsigned long int i = 0, j = 0, reg; u32 pll1_rate;

+ turn_off_display(MX53_IPU_CTRL_BASE_ADDR + ((128 - 32) << 20)); + pll1_base = ioremap(MX53_BASE_ADDR(PLL1_BASE_ADDR), SZ_4K); pll2_base = ioremap(MX53_BASE_ADDR(PLL2_BASE_ADDR), SZ_4K); pll3_base = ioremap(MX53_BASE_ADDR(PLL3_BASE_ADDR), SZ_4K); @@ -4955,9 +4969,7 @@ int __init mx53_clocks_init(unsigned long ckil, unsigned long osc, unsigned long __raw_writel(0, MXC_CCM_CCGR3); __raw_writel(1 << MXC_CCM_CCGRx_CG8_OFFSET, MXC_CCM_CCGR4);

- /* if ipu enabled, leave enabled, else sleep handshake will fail */ - reg = __raw_readl(MXC_CCM_CCGR5) & (3 << MXC_CCM_CCGRx_CG5_OFFSET); - __raw_writel(reg | 1 << MXC_CCM_CCGRx_CG2_OFFSET | + __raw_writel(1 << MXC_CCM_CCGRx_CG2_OFFSET | 1 << MXC_CCM_CCGRx_CG6_OFFSET | 3 << MXC_CCM_CCGRx_CG7_OFFSET | 1 << MXC_CCM_CCGRx_CG8_OFFSET |