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Hello;
I am developing Device tree description for a custom board using AM335x SoC equipped with two NAND flash chips connected to the GPMC. Do I understand it correctly that since only one NAND chip is configured in the U-boot, it is not possible to use two NAND chips in FDT Linux? My understanding comes from this document: https://git.kernel.org/cgit/linux/kernel/git/tmlind/linux-omap.git/tree/Documentation/devicetree/bindings/bus/ti-gpmc.txt#n30
When I try to define the NAND flash chips as follows:
&gpmc {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&nandflash_pins_s0>;
ranges = <0 0 0x08000000 0x01000000 /* CS0 0 @addr 0x08000000, size 0x01000000 */
1 0 0x09000000 0x01000000>; /* CS1 */
nand@0,0 {
reg = <0 0 0x01000000>; /* CS0 */
ti,nand-ecc-opt = "bch8";
ti,elm-id = <&elm>;
nand-bus-width = <8>;
/* ...
...
*/ };
nand@1,0 {
reg = <1 0 0x01000000>; /* CS1 */
ti,nand-ecc-opt = "bch8";
ti,elm-id = <&elm>;
nand-bus-width = <8>;
/* ...
...
*/
};
};I get the following messages in kernel log during boot:
[ 2.492863] omap-gpmc 50000000.gpmc: GPMC revision 6.0 [ 2.500541] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xf1 [ 2.507375] nand: Micron MT29F1G08ABADAH4 [ 2.511602] nand: 128MiB, SLC, page size: 2048, OOB size: 64 [ 2.517610] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme [ 2.540205] kobject (c08a4b10): tried to init an initialized object, something is seriously wrong. [ 2.549824] CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G W 3.15.0-rc5-12766-g8e7bffa-dirty #22 [ 2.559881] Workqueue: deferwq deferred_probe_work_func [ 2.565492] [<c00147dc>] (unwind_backtrace) from [<c00119a8>] (show_stack+0x10/0x14) [ 2.573719] [<c00119a8>] (show_stack) from [<c057a8c0>] (dump_stack+0x80/0x9c) [ 2.581340] [<c057a8c0>] (dump_stack) from [<c02fa080>] (kobject_init+0x74/0x94) [ 2.589199] [<c02fa080>] (kobject_init) from [<c0376cf8>] (device_initialize+0x20/0xc4) [ 2.597692] [<c0376cf8>] (device_initialize) from [<c037bd6c>] (platform_device_register+0x10/0x24) [ 2.607283] [<c037bd6c>] (platform_device_register) from [<c00388d4>] (gpmc_nand_init+0x118/0x224) [ 2.616789] [<c00388d4>] (gpmc_nand_init) from [<c00246f8>] (gpmc_probe+0x52c/0x834) [ 2.625004] [<c00246f8>] (gpmc_probe) from [<c037b738>] (platform_drv_probe+0x18/0x48) [ 2.633394] [<c037b738>] (platform_drv_probe) from [<c037a3dc>] (driver_probe_device+0x10c/0x238) [ 2.642795] [<c037a3dc>] (driver_probe_device) from [<c0378ac4>] (bus_for_each_drv+0x44/0x8c) [ 2.651769] [<c0378ac4>] (bus_for_each_drv) from [<c037a298>] (device_attach+0x74/0x8c) [ 2.660247] [<c037a298>] (device_attach) from [<c0379968>] (bus_probe_device+0x88/0xb0) [ 2.668724] [<c0379968>] (bus_probe_device) from [<c0379d6c>] (deferred_probe_work_func+0x64/0x94) [ 2.678211] [<c0379d6c>] (deferred_probe_work_func) from [<c0057654>] (process_one_work+0x1b4/0x4bc) [ 2.687877] [<c0057654>] (process_one_work) from [<c0057d3c>] (worker_thread+0x11c/0x398) [ 2.696547] [<c0057d3c>] (worker_thread) from [<c005e318>] (kthread+0xc8/0xe4) [ 2.704209] [<c005e318>] (kthread) from [<c000e808>] (ret_from_fork+0x14/0x2c) [ 2.711845] ------------[ cut here ]------------ [ 2.716781] WARNING: CPU: 0 PID: 6 at /tmp/linux-omap/kernel/resource.c:638 __insert_resource+0x124/0x130() [ 2.730086] Modules linked in: [ 2.733369] CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G W 3.15.0-rc5-12766-g8e7bffa-dirty #22 [ 2.743397] Workqueue: deferwq deferred_probe_work_func [ 2.748921] [<c00147dc>] (unwind_backtrace) from [<c00119a8>] (show_stack+0x10/0x14) [ 2.757135] [<c00119a8>] (show_stack) from [<c057a8c0>] (dump_stack+0x80/0x9c) [ 2.764797] [<c057a8c0>] (dump_stack) from [<c003f79c>] (warn_slowpath_common+0x6c/0x90) [ 2.773368] [<c003f79c>] (warn_slowpath_common) from [<c003f7dc>] (warn_slowpath_null+0x1c/0x24) [ 2.782669] [<c003f7dc>] (warn_slowpath_null) from [<c0044e40>] (__insert_resource+0x124/0x130) [ 2.791831] [<c0044e40>] (__insert_resource) from [<c0045ac4>] (insert_resource_conflict+0x24/0x3c) [ 2.801408] [<c0045ac4>] (insert_resource_conflict) from [<c0045ae4>] (insert_resource+0x8/0x18) [ 2.810711] [<c0045ae4>] (insert_resource) from [<c037b8b8>] (platform_device_add+0x88/0x210) [ 2.819741] [<c037b8b8>] (platform_device_add) from [<c00388d4>] (gpmc_nand_init+0x118/0x224) [ 2.828773] [<c00388d4>] (gpmc_nand_init) from [<c00246f8>] (gpmc_probe+0x52c/0x834) [ 2.836982] [<c00246f8>] (gpmc_probe) from [<c037b738>] (platform_drv_probe+0x18/0x48) [ 2.845371] [<c037b738>] (platform_drv_probe) from [<c037a3dc>] (driver_probe_device+0x10c/0x238) [ 2.854763] [<c037a3dc>] (driver_probe_device) from [<c0378ac4>] (bus_for_each_drv+0x44/0x8c) [ 2.863789] [<c0378ac4>] (bus_for_each_drv) from [<c037a298>] (device_attach+0x74/0x8c) [ 2.872215] [<c037a298>] (device_attach) from [<c0379968>] (bus_probe_device+0x88/0xb0) [ 2.880692] [<c0379968>] (bus_probe_device) from [<c0379d6c>] (deferred_probe_work_func+0x64/0x94) [ 2.890176] [<c0379d6c>] (deferred_probe_work_func) from [<c0057654>] (process_one_work+0x1b4/0x4bc) [ 2.899842] [<c0057654>] (process_one_work) from [<c0057d3c>] (worker_thread+0x11c/0x398) [ 2.908505] [<c0057d3c>] (worker_thread) from [<c005e318>] (kthread+0xc8/0xe4) [ 2.916165] [<c005e318>] (kthread) from [<c000e808>] (ret_from_fork+0x14/0x2c) [ 2.923813] ---[ end trace aabf67c205bfd88e ]--- [ 2.928684] omap2-nand omap2-nand.0: failed to claim resource 0 [ 2.934968] omap2-nand omap2-nand.0: Unable to register NAND device
The kernel I am using is 3.15-rc5 from the kernel.org linux-omap repository.
Am I doing something wrong or the GPMC driver is lacking the capability of defining multiple NAND flash chips entirely in Device tree?
Thank you for any suggestions;
