[meta-xilinx] uboot CONFIG_SYS_SDRAM_SIZE allocation error

[Arno Steffens]

I switched from an older yocto u-boot (2015.01) to recent one (2016.01). Now I can't boot anymore:

Zynq> boot
QSPI: Kernel/Devicetree - NFS: rootfs
SF: Detected S25FL128S_64K with page size 256 Bytes, erase size 64 KiB, total 16 MiB
device 0 offset 0x4b0000, size 0x10000
SF: 65536 bytes @ 0x4b0000 Read: OK
device 0 offset 0x4c0000, size 0x380000
SF: 3670016 bytes @ 0x4c0000 Read: OK
## Booting kernel from Legacy Image at 02080000 ...
   Image Name:   Linux-4.4.0-xilinx
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    3513736 Bytes = 3.4 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 02000000
   Booting using the fdt blob at 0x2000000
   Loading Kernel Image ... OK
ERROR: Failed to allocate 0x82a5 bytes below 0x0.
device tree - allocation error
FDT creation failed! hanging...### ERROR ### Please RESET the board ###

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My guess for reason of that is following, but I can't solve it.

My board (based on MicroZed) has 512MB Ram, but 16MB are used for FPGA.

I managed that before with 
 #ifndef __CONFIG_ZYNQ_MICROZED_H
 #define __CONFIG_ZYNQ_MICROZED_H
 
-#define CONFIG_SYS_SDRAM_SIZE		(1024 * 1024 * 1024)
+#define CONFIG_SYS_SDRAM_SIZE		(496 * 1024 * 1024)

In newer Uboot I can't find this definition not in that way. Nevertheless I added this line.
(If not, that my last message is "Starting kernel ...")

Although digging around, I couldn't find how nowadays this is handled. This seems memory size is not board-specific anymore. How it is handled?

Thanks