Can you help me understand this strange bug on a10s-olinuxino-m? I guess my
DT record for NAND MTD partitions is somehow incorrect because I happen to
get a kernel panic in the mainline 3.19 kernel that looks like this:
[ 0.599782] nand: device found, Manufacturer ID: 0xad, Chip ID: 0xde
[ 0.606203] nand: Hynix H27UCG8T2ETR-BC 8GiB 3.3V 8-bit
[ 0.611433] nand: 8192 MiB, MLC, erase size: 4096 KiB, page size: 16384,
OOB size: 1664
[ 0.628428] Bad block table found at page 524032, version 0x01
[ 0.650299] Bad block table found at page 523776, version 0x01
[ 0.664100] nand_bbt: ECC error in BBT at 0x0000ffc00005
[ 0.677393] nand_bbt: ECC error in BBT at 0x0000ff800005
[ 0.682711] Scanning device for bad blocks
[ 1.086137] random: nonblocking pool is initialized
[ 1.769233] Bad eraseblock 1992 at 0x0001f23fc000
[ 1.814688] Bad block table written to 0x0001ffc00000, version 0x01
[ 1.832192] Bad block table written to 0x0001ff800000, version 0x01
[ 1.839592] 4 ofpart partitions found on MTD device H27UCG8T2ETR-BC 8GiB
3.3V 8-bit
[ 1.847297] Creating 4 MTD partitions on "H27UCG8T2ETR-BC 8GiB 3.3V
8-bit":
[ 1.854275] 0x000000000000-0x000000400000 : "boot0"
[ 1.859622] 0x000000400000-0x000000800000 : "boot1"
[ 1.864877] 0x000000800000-0x000001800000 : "kernel"
[ 1.870197] 0x000001800000-0x000200000000 : "rootfs"
<...snip...>
[ 2.124638] Registering SWP/SWPB emulation handler
[ 2.129842] Unable to handle kernel NULL pointer dereference at virtual
address 00000713
SWP/SWPB instruction emulation has nothing to do with the NFC. The kernel
boots OK as soon as I disable the NFC in the device tree. In a successful
boot attempt, this is followed by mmc0 initialisation. So, it looks like
the culprit is mmc0. However, disabling the leaf mmc nodes in the device
tree does not change the outcome.
Here is my nfc configuration added to the mainline
sunxi-a10s-olinuxino-micro.dts. The pinctrl-0 definitions are standard,
same as in Boris' repo for Cubietruck.
nfc: nand@01c03000 { compatible = "allwinner,sun4i-a10-nand"; reg =
<0x01c03000 0x1000>; interrupts = <37>; clocks = <&ahb_gates 13>,
<&nand_clk>; clock-names = "ahb", "mod"; #address-cells = <1>; #size-cells
= <0>; pinctrl-names = "default"; pinctrl-0 = <&nand_pins_a
&nand_cs0_pins_a &nand_rb0_pins_a>; status = "okay"; nand@0 { reg = <0>;
allwinner,rb = <0>; #address-cells = <1>; #size-cells = <2>;
nand-on-flash-bbt; nand-ecc-mode = "hw"; boot0@0 { label = "boot0"; reg =
<0x0 0x0 0x400000>; }; boot1@400000 { label = "boot1"; reg = <0x400000 0x0
0x400000>; }; kernel@800000 { label = "kernel"; reg = <0x800000 0x0
0x1000000>; }; rootfs@1800000 { label = "rootfs"; reg = <0x1800000 0x1
0xfe800000>; }; }; };
--Vladimir
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