TP-Link TL-WDR 4900 have u-boot with read-only env.
Boot command read only 0x29F000 data from flash.
Bigger images causes crc error. It can't be changed.
This patch add kernel size checking.
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [utilize KERNEL_SIZE]
b3f7a73860