Hi,
I am trying to port UIO driver for AM437X. I know that TI is not recommending this. Just i want check basic stubs through PRU. So i am doing this activity. I slightly modified uio driver loader library by giving some inputs
#define AM43XX_PRU_MMAP_SIZE 0x40000
#define AM43XX_DATARAM0_PHYS_BASE 0x54400000
#define AM43XX_DATARAM1_PHYS_BASE 0x54402000
#define AM43XX_PRUSS_SHAREDRAM_BASE 0x54410000
#define AM43XX_INTC_PHYS_BASE 0x54420000
#define AM43XX_PRU0CONTROL_PHYS_BASE 0x54422000
#define AM43XX_PRU1CONTROL_PHYS_BASE 0x54424000
#define AM43XX_PRUSS_CFG_BASE 0x54426000
#define AM43XX_PRUSS_UART_BASE 0x54428000
#define AM43XX_PRUSS_IEP_BASE 0x5442E000
#define AM43XX_PRUSS_ECAP_BASE 0x54430000
#define AM43XX_PRUSS_EXT_BASE 0x54440000
#define AM43XX_PRUSS_OCP_HP_BASE 0x54480000
#define AM43XX_PRU0IRAM_PHYS_BASE 0x54434000
#define AM43XX_PRU1IRAM_PHYS_BASE 0x54438000
#define AM43XX_PRU0DEBUG_PHYS_BASE 0x54422400
#define AM43XX_PRU1DEBUG_PHYS_BASE 0x54424400
Everything goes fine. As soon as enable the PRU 0 control registers. I am keep on getting following crash/warning messages from kernel. It is pointing ICSS0 instead of ICSS1
I/PRU_DRV_INTERFACE( 2267): prussdrv_open
I/PRU_DRV_INTERFACE( 2267): __prussdrv_memmap_init
I/PRU_DRV_INTERFACE( 2267): Checking PRU Revision id...
I/PRU_DRV_INTERFACE( 2267): value is 0x4e82a900
I/PRU_DRV_INTERFACE( 2267): Revision id: 3
I/PRU_DRV_INTERFACE( 2267): AM437X
I/PRU_DRV_INTERFACE( 2267): File ./blinker.bin open passed
I/PRU_DRV_INTERFACE( 2267): Writing firmware data into PRU ICSS ...
I/PRU_DRV_INTERFACE( 2267): prussdrv_pru_write_memory ram id: 2
I/PRU_DRV_INTERFACE( 2267): prussdrv_pru_enable enter
I/PRU_DRV_INTERFACE( 2267): PRU Control register value 0x00000001
I/PRU_DRV_INTERFACE( 2267): After PRU enable 0x00000002
I/PRU_DRV_INTERFACE( 2267): prussdrv_pru_enable exit
[ 33.567739] ------------[ cut here ]------------
[ 33.572702] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:137 l3_interrupt_handler+0x194/0x28c()
[ 33.582617] L3 custom error: MASTER:ICSS0 TARGET:L4_PER 1
[ 33.588365] Modules linked in: omaplfb(O) pvrsrvkm(O)
[ 33.593770] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W O 3.12.20-ga021885-dirty #24
[ 33.602665] Backtrace:
[ 33.605286] [<c00186e4>] (dump_backtrace+0x0/0x10c) from [<c0018880>] (show_stack+0x18/0x1c)
[ 33.614274] r6:00000000 r5:ffffffff r4:00000000 r3:00000000
[ 33.620341] [<c0018868>] (show_stack+0x0/0x1c) from [<c06a0288>] (dump_stack+0x7c/0xbc)
[ 33.628886] [<c06a020c>] (dump_stack+0x0/0xbc) from [<c004af00>] (warn_slowpath_common+0x6c/0x90)
[ 33.638336] r6:00000089 r5:00000009 r4:c0927e08 r3:00000000
[ 33.644393] [<c004ae94>] (warn_slowpath_common+0x0/0x90) from [<c004afc8>] (warn_slowpath_fmt+0x38/0x)
[ 33.654490] r8:00000002 r7:00080003 r6:f1000200 r5:00000001 r4:c09863dc
[ 33.661663] [<c004af90>] (warn_slowpath_fmt+0x0/0x40) from [<c02ca5f0>] (l3_interrupt_handler+0x194/0)
[ 33.671945] r3:c09861c4 r2:c082f478
[ 33.675774] [<c02ca45c>] (l3_interrupt_handler+0x0/0x28c) from [<c0083f94>] (handle_irq_event_percpu+)
[ 33.686618] [<c0083f40>] (handle_irq_event_percpu+0x0/0x19c) from [<c0084120>] (handle_irq_event+0x44)
[ 33.697003] [<c00840dc>] (handle_irq_event+0x0/0x64) from [<c00871dc>] (handle_fasteoi_irq+0xa0/0x160)
[ 33.706915] r6:c0923f98 r5:ed006254 r4:ed006200 r3:00000000
[ 33.712970] [<c008713c>] (handle_fasteoi_irq+0x0/0x160) from [<c0083904>] (generic_handle_irq+0x28/0x)
[ 33.723067] r5:c092ec08 r4:0000002a
[ 33.726899] [<c00838dc>] (generic_handle_irq+0x0/0x38) from [<c00159b8>] (handle_IRQ+0x60/0xdc)
[ 33.736163] r4:0000002a r3:00000182
[ 33.739985] [<c0015958>] (handle_IRQ+0x0/0xdc) from [<c000885c>] (gic_handle_irq+0x30/0x64)
[ 33.748879] r8:c09b99a4 r7:fa240100 r6:c0927f30 r5:c092ed70 r4:fa24010c
r3:00000100
[ 33.757263] [<c000882c>] (gic_handle_irq+0x0/0x64) from [<c06a6600>] (__irq_svc+0x40/0x74)
[ 33.766067] Exception stack(0xc0927f30 to 0xc0927f78)
[ 33.771449] 7f20: ffffffed 008f1000 c092f640 c00264a0
[ 33.780162] 7f40: c0926000 00000000 c092e950 c06b1104 c09b99a4 c09b99a4 00000001 c0927f84
[ 33.788874] 7f60: c0927f78 c0927f78 c0015d9c c0015d8c 60070013 ffffffff
[ 33.795917] r7:c0927f64 r6:ffffffff r5:60070013 r4:c0015d8c
[ 33.801973] [<c0015d5c>] (arch_cpu_idle+0x0/0x4c) from [<c00835fc>] (cpu_startup_entry+0x68/0x158)
[ 33.811525] [<c0083594>] (cpu_startup_entry+0x0/0x158) from [<c069a768>] (rest_init+0x78/0x90)
[ 33.820696] r7:c09080a0 r3:c0926000
[ 33.824530] [<c069a6f0>] (rest_init+0x0/0x90) from [<c08c6af8>] (start_kernel+0x2b8/0x314)
[ 33.833332] r4:c092ea18 r3:00000000
[ 33.837154] [<c08c6840>] (start_kernel+0x0/0x314) from [<80008074>] (0x80008074)
[ 33.845031] ---[ end trace 6e5c04b7e722d4b8 ]---
Now what configurations i have to check.
