imx6ul的uboot启动logo如何一直显示到kernel起来

just123456

如题，现在的情况是uboot启动logo显示到kernel起来时会黑屏，然后显示kernel的启动logo，我想两者不间断显示，不知道怎么做，请大神指点迷津

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just123456

内核源码是linux-4.1.15，uboot源码是u-boot-imx-2015.04-r0，uboot启动logo显示后，运行到打印信息为start kernel处LCD黑屏，然后等初始化完成后显示kernel的启动logo，造成LCD黑屏的原因应该是framebuffer被刷新了，我想把黑屏的情况避免掉，uboot和kernel不间断显示logo。

just123456

In:    serial
Out:   serial
Err:   serial
Net:   FEC1
Normal Boot
Hit any key to stop autoboot:  0
switch to partitions #0, OK
mmc1(part 0) is current device

MMC read: dev # 1, block # 2048, count 16384 ... 16384 blocks read: OK
Booting from mmc ...
switch to partitions #0, OK
mmc1(part 0) is current device

MMC read: dev # 1, block # 18432, count 8192 ... 8192 blocks read: OK
Kernel image @ 0x80800000 [ 0x000000 - 0x645d40 ]
## Flattened Device Tree blob at 83000000
   Booting using the fdt blob at 0x83000000
   Loading Device Tree to 9ef3c000, end 9ef47702 ... OK

Starting kernel ...

announce_and_cleanup
Booting Linux on physical CPU 0x0
Linux version 4.1.15 (lvmh@QiyangServer) (gcc version 4.7.3 20121205 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2012.12-20121214 - Linaro GCC 2012.12) ) #43 SMP PREEMPT Wed Mar 29 14:40:35 CST 2017
CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine model: QIYANG i.MX6 UltraLite 14x14 EVK Board
Memory policy: Data cache writealloc
PERCPU: Embedded 12 pages/cpu @9fbd2000 s16960 r8192 d24000 u49152
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 130048
Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk1p1 rootwait rw ethaddr=08:00:3e:26:0a:5b
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 507388K/524288K available (8159K kernel code, 426K rwdata, 2816K rodata, 336K init, 432K bss, 16900K reserved, 0K cma-reserved, 0K highmem)
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    vmalloc : 0xa0800000 - 0xff000000   (1512 MB)
    lowmem  : 0x80000000 - 0xa0000000   ( 512 MB)
    pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
    modules : 0x7f000000 - 0x7fe00000   (  14 MB)
      .text : 0x80008000 - 0x80abffb8   (10976 kB)
      .init : 0x80ac0000 - 0x80b14000   ( 336 kB)
      .data : 0x80b14000 - 0x80b7e860   ( 427 kB)
       .bss : 0x80b81000 - 0x80bed3a0   ( 433 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Preemptible hierarchical RCU implementation.
        Additional per-CPU info printed with stalls.
        RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
NR_IRQS:16 nr_irqs:16 16
mxc_clocksource_init 24000000
Switching to timer-based delay loop, resolution 41ns
sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
clocksource mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
Console: colour dummy device 80x30

运行到announce_and_cleanup黑屏（背光亮的），大约运行到console:....这里显示kernel的logo，新手，请大神指点迷津

just123456

谁知道解决的办法，或者是谁有补丁，麻烦告诉我下，谢谢

ALTIUM2

小伙儿，你这说的也太笼统了，大伙儿也没法帮你啊。

比如啥开发板，啥系统，运行到哪里等等……

技术范儿

详细的说明下问题，最好把Log打包放上来

星岚￥辰

楼主问题有没有解决？

alee2alee

不知道楼主解决了没有,我也想实现同样的功能,我目前的情况是: uboot阶段读取emmc中的logo图片通过lvds输出显示,在进入kernel就会黑屏,直到kernel的mxc_ipuv3_fb.c重新刷FB,才开始正常显示,所以有没有什么方法,或内核有没有补丁来实现uboot中的logo一直显示,而不出现闪烁的情况呢?