Hi Professionals! We have to bother you by a question again.
Question: we don't understand and need your help:
We are currently using AM1810 for our developing board.
Cited the printout here during the starting up process. As it is shown in red, we first time met this warning-"Unable to obtain voltage regulator for CVDD; voltage scaling unsupported".
How can we figure it out?
"WARNING: at arch/arm/mach-davinci/da850.c:1244 da850_regulator_init+0x3c/0x58()
Unable to obtain voltage regulator for CVDD; voltage scaling unsupported
Modules linked in:
Backtrace:
[<c0031708>] (dump_backtrace+0x0/0x114) from [<c0300ff8>] (dump_stack+0x18/0x1c)
r7:c781fd28 r6:c0038f78 r5:c0399e04 r4:000004dc
[<c0300fe0>] (dump_stack+0x0/0x1c) from [<c0041544>] (warn_slowpath_common+0x50/
0x68)
[<c00414f4>] (warn_slowpath_common+0x0/0x68) from [<c00415a8>] (warn_slowpath_fm
t+0x30/0x38)
ata1: SATA link down (SStatus 0 SControl 300)
r7:c79cb860 r6:c0449bcc r5:c0401d50 r4:c042e0f4
[<c0041578>] (warn_slowpath_fmt+0x0/0x38) from [<c0038f78>] (da850_regulator_ini
t+0x3c/0x58)r3:00000000 r2:c0399e22
[<c0038f3c>] (da850_regulator_init+0x0/0x58) from [<c000f79c>] (davinci_cpu_init
+0x40/0xc0)r5:c0401d50 r4:c79d8d80
[<c000f75c>] (davinci_cpu_init+0x0/0xc0) from [<c0231adc>] (cpufreq_add_dev+0x15
8/0x3a4)r5:c79d8d80 r4:00000000
[<c0231984>] (cpufreq_add_dev+0x0/0x3a4) from [<c01a8564>] (sysdev_driver_regist
er+0xb8/0x128)
[<c01a84ac>] (sysdev_driver_register+0x0/0x128) from [<c0230ed4>] (cpufreq_regis
ter_driver+0x90/0xfc)
r6:c040400c r5:c0449bcc r4:c0404044
[<c0230e44>] (cpufreq_register_driver+0x0/0xfc) from [<c000f73c>] (davinci_cpufr
eq_probe+0x90/0xb0)
r5:c0400680 r4:c042e124
[<c000f6ac>] (davinci_cpufreq_probe+0x0/0xb0) from [<c01aac00>] (platform_drv_pr
obe+0x20/0x24)
r5:c0400e50 r4:c0400e50
[<c01aabe0>] (platform_drv_probe+0x0/0x24) from [<c01a9c10>] (driver_probe_devic
e+0xb0/0x164)
[<c01a9b60>] (driver_probe_device+0x0/0x164) from [<c01a9d2c>] (__driver_attach+
0x68/0x8c)
r7:c79cb860 r6:c040400c r5:c0400e84 r4:c0400e50
[<c01a9cc4>] (__driver_attach+0x0/0x8c) from [<c01a9408>] (bus_for_each_dev+0x50
/0x84) r7:c79cb860 r6:c040400c r5:c01a9cc4 r4:00000000
[<c01a93b8>] (bus_for_each_dev+0x0/0x84) from [<c01a9a74>] (driver_attach+0x20/0
x28) r6:c040400c r5:c040400c r4:c0024c04
[<c01a9a54>] (driver_attach+0x0/0x28) from [<c01a8ce0>] (bus_add_driver+0xa8/0x2
34)
[<c01a8c38>] (bus_add_driver+0x0/0x234) from [<c01aa048>] (driver_register+0xb0/
0x13c)
[<c01a9f98>] (driver_register+0x0/0x13c) from [<c01ab06c>] (platform_driver_regi
ster+0x4c/0x60) r9:00000000 r8:00000000
r7:00000000 r6:c000f688 r5:c0403ff8 r4:c0024c04
[<c01ab020>] (platform_driver_register+0x0/0x60) from [<c01ab0a0>] (platform_dri
ver_probe+0x20/0x98)
[<c01ab080>] (platform_driver_probe+0x0/0x98) from [<c000f6a0>] (davinci_cpufreq
_init+0x18/0x24)
r7:00000000 r6:c000f688 r5:00000000 r4:c0024c04
[<c000f688>] (davinci_cpufreq_init+0x0/0x24) from [<c002d3a4>] (do_one_initcall+
0x64/0x1c4)
[<c002d340>] (do_one_initcall+0x0/0x1c4) from [<c0008484>] (kernel_init+0xac/0x1
4c)
r7:00000000 r6:00000000 r5:00000000 r4:c0024c04
[<c00083d8>] (kernel_init+0x0/0x14c) from [<c0044c88>] (do_exit+0x0/0x5ec)
r5:00000000 r4:00000000
---[ end trace a67e5ca621336c93 ]---"