I've rebuilt the kernel today and noting the remarks about having to have matching firmware for this kernel I did an rpi-update, skipping the kernel, so I've got new start.elfs and bootcode.bin. Now when the Pi boots it takes much longer than before and in dmesg o/p I have :
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mmc0: final write to SD card still running eth0: no IPv6 routers present mmc0: Timeout waiting for hardware interrupt - cmd12. mmcblk0: error -110 sending stop command, original cmd response 0x900, card status 0x900
Timing buffered disk reads: 60 MB in 3.05 seconds = 19.68 MB/sec
I suspect I may have an incompatibility in the init_emmc_clock=xxxx and that it's trying to write to my class 4 card too quickly and failing sometimes
How can I check and hopefully put it right?