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Testing ff1c7e1, all boots fine, but vchiq is not there. I hadn't any gpu_mem related option in config.txt. I've tried gpu_mem=128, and gpu_mem_512=128, but nothing helps.
The kernel log:
...
[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708.boardrev=0xf bcm2708.serial=0xe3e92703 smsc95xx.macaddr=B8:27:EB:E9:27:03 sdhci-bcm2708.emmc_clock_freq=100000000 vc_mem.mem_base=0x1c000000 vc_mem.mem_size=0x20000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Memory: 448MB = 448MB total
[ 0.000000] Memory: 432232k/432232k available, 26520k reserved, 0K highmem
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xdc800000 - 0xff000000 ( 552 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xdc000000 ( 448 MB)
[ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)
[ 0.000000] .text : 0xc0008000 - 0xc04ee148 (5017 kB)
[ 0.000000] .init : 0xc04ef000 - 0xc050fce8 ( 132 kB)
[ 0.000000] .data : 0xc0510000 - 0xc0544220 ( 209 kB)
[ 0.000000] .bss : 0xc0544244 - 0xc05ec8f0 ( 674 kB)
...
[ 1.048574] bcm2708_dma: DMA manager at f2007000
[ 1.053365] bcm2708_gpio: bcm2708_gpio_probe c051dd78
[ 1.058806] vc-mem: phys_addr:0x00000000 mem_base=0x1c000000 mem_size:0x20000000(512 MiB)
...
[ 1.287093] vc-cma: Videocore CMA driver
[ 1.293417] vc-cma: vc_cma_base = 0x00000000
[ 1.300418] vc-cma: vc_cma_size = 0x00000000 (0 MiB)
[ 1.307943] vc-cma: vc_cma_initial = 0x00000000 (0 MiB)
[ 1.324796] brd: module loaded
[ 1.335179] loop: module loaded
[ 1.340826] ERROR: 256 KiB atomic DMA coherent pool is too small!
[ 1.340826] Please increase it with coherent_pool= kernel parameter!
[ 1.357266] vchiq: Unable to allocate channel memory
[ 1.364563] vchiq: could not load vchiq
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