DM6467 PCI driver insertion after DSP warm Reset

Jayakrishnan

Expert 2790 points

Hi I want to use warm reset (active low RESET) of DM6467 which is a PCI device for a PPC host.

I am able to insert the PCI boot driver after a power on reset.

But when I try to do it after a warm reset, it fails. I checked and ensured that PCI config registers

are not modified after warm reset. The error is, when the driver tries to access pci registers (DM6467 internal),

it hangs. MMR registers are mapped to correct value. Any suggestions?

O/P Messages root@mpc8536ds ~/nfs # insmod dm646x_pci_boot.ko

DM646x PCI Boot: Major number 252 assigned, minor # 1

PCIDRV - Added device to the sys file system Found DM646x PCI device at 0xdc026000

PCIDRV -Found PCI Devices

PCIDRV - BAR Configuration -

Start | Length | Flags

0x82840000 | 32768 | 0x00020200

0x82848000 | 32768 | 0x00020200

0x82000000 | 4194304 | 0x00020200

0x82800000 | 131072 | 0x00021208

ARM TCM RAM memory mapped to 0xe1120000 DDR2

Memory Controller registers mapped to 0xe1130000

MMR registers mapped to 0xe1200000

Regards

over 15 years ago

0 Varada Bellary over 15 years ago

TI__Expert 5750 points

There is not much difference between POR and Warm Reset. After warm RESET of DM6467, the boot pins are re-latched. Hope that has not changed between resets.

Can you tell us which specific MMR you are trying to access, when the driver hangs ?

Regards
Varada

0 Varada Bellary over 15 years ago

TI__Expert 5750 points

There is not much difference between POR and Warm Reset. After warm RESET of DM6467, the boot pins are re-latched. Hope that has not changed between resets.

Can you tell us which specific MMR you are trying to access, when the driver hangs ?

Regards
Varada

0 Jayakrishnan over 15 years ago in reply to Varada Bellary

Expert 2790 points

Thank you Varada for your response. In fact the driver is working now. The problem was the BAR registers were getting corrupted after warm reset.

The issue was resolved after loading them with the correct values.

Regards

0 Varada Bellary over 15 years ago in reply to Jayakrishnan

TI__Expert 5750 points

JK - glad to know that you could resolve it. May I know which BAR register(s).

Thanks
Varada

0 Jayakrishnan over 15 years ago in reply to Varada Bellary

Expert 2790 points

Varada,

The BAR registers are PCIBAR0 ~ PCIBAR5

--JK

0 Varada Bellary over 15 years ago in reply to Jayakrishnan

TI__Expert 5750 points

Thanks JK. I wanted to know which one of them or all, on DM6467.

Regards

VArada

0 Jayakrishnan over 15 years ago in reply to Varada Bellary

Expert 2790 points

Varada,

In my case PCIBAR2 value is changed after warm reset. But I overwritten other registers too , just to make sure.

Regards

Processors

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DM6467 PCI driver insertion after DSP warm Reset