[U-Boot] Trying to load old kernel with new u-boot

[DaveKucharczyk]

One of our mx51 based boards doesn't seem to like 2.6.35 kernel with 2014.07
u-boot.
We've ported our boards for the new kernel and new u-boot, but we need the
old kernel to also work with new u-boot.

So here's what happens...

U-Boot 2014.07-svn83200 (Sep 15 2015 - 15:57:02)

CPU:   Freescale i.MX51 rev3.0 at 800 MHz
I2C:   ready
DRAM:  512 MiB
Last reset reason:POR, (1)
Boot Device: MMC
MMC:   FSL_SDHC: 0
In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0

MMC read: dev # 0, block # 2048, count 6144 ... 6144 blocks read: OK
## Booting kernel from Legacy Image at 92000000 ...
   Image Name:   Linux-2.6.35.3-1129-g691c08a+
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2873388 Bytes = 2.7 MiB
   Load Address: 90008000
   Entry Point:  90008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK

Starting kernel ...

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console [ttymxc1] enabled, bootconsole disabled
blah blah
boot continues as normal...

Looks like new u-boot passes something wrong to the kernel or doesn't pass
something we need. 

Seems like the first half of the kernel output timing is wrong. I tried
different bauds to no avail. 

On a working board we see early on...

entering mx51_clocks_init
turning off all clocks
external_low_reference = 00008000
external_high_reference = 01588800
ckih2_reference = 01770000
oscillator_reference = 016e3600
entering clk_tree_init
clk_tree_init for mx51
returned from clk_tree_init
setting uart_main_clk to pll3_sw_clk
MXC_CCM_CSCDR1 is 00c30458
MXC_Early serial console at MMIO 0x73fc0000 (options '115200')
bootconsole [ttymxc1] enabled

And then later...
console [ttymxc1] enabled, bootconsole disabled

Looks like the early console is not working. I'll have to debug this
tomorrow, but if anyone has suggestions that would be great. 



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