Linux: AM3354:Uncompressing Linux... done, booting the kernel.

Hefa Zhuang

Other Parts Discussed in Thread: AM3354

Tool/software: Linux

I have a custom board of which cpu is AM3354.It doesn't have EEPROM and RTC. I disabled the RTC and EEPROM detected related module during u-boot and now u-boot is able to boot. But the kernel is hanging after print "Uncompressing Linux... done, booting the kernel." After a while, the cpu automatically reset.

I used the printascii and located the error happened in __turn_mmu_on:

mcr p15, 0, r0, c1, c0, 0 @ write control reg
mrc p15, 0, r3, c0, c0, 0 @ read id reg
instr_sync

What should I do to solve the problem?

In addition, if I don't have an RTC chip, should RTC_PWRONRSTn be pulled low?

I would be grateful if I could get a reply as soon as possible.Thank you!

over 6 years ago

0 Kemal R. Shakir over 6 years ago

TI__Guru 55345 points

Hello Hefa,

Please, try deleting the lines shown in this post and check whether your board will start to load the kernel. For the RTC_PWRONRSTn terminal please refer this post and this thread.

Best regards,
Kemal

0 Hefa Zhuang over 6 years ago in reply to Kemal R. Shakir

Prodigy 200 points

Hello Kemal,

From the first link you gave me, I should delete the rtc-related part of the am33xx.dtsi file. I have tried this, but when I compiled the device tree file in the SDK, I found that many .dts files depend on am33xx.dtsi. So I removed these in am335x-boneblack-common.dtsi and am335x-bone-common.dtsi and didn't delete the rtc-related codes int am33xx.dtsi. But when using the recompiled device tree file, kernel still hanged and print "Uncompressing Linux... done, booting the kernel.".

RTC_PWRONRSTn on my board is connected to VSS.

Whtat should I do next?

0 Kemal R. Shakir over 6 years ago in reply to Hefa Zhuang

TI__Guru 55345 points

Hello Hefa,

Next, you can refer to the tips in this post.

Best regards,
Kemal

0 Kemal R. Shakir over 6 years ago in reply to Kemal R. Shakir

TI__Guru 55345 points

Hello Hefa,

Do you have any progress with this issue?

Best regards,
Kemal

0 Kemal R. Shakir over 6 years ago in reply to Kemal R. Shakir

TI__Guru 55345 points

Hi Hefa,

I’ve not heard back from you for a month. I hope we were able to help. I’m going to close the thread now and mark the issue resolved. If you have any follow-up questions, please reply to this thread or start a new thread.

Thanks,
Kemal

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Linux: AM3354:Uncompressing Linux... done, booting the kernel.