DRA821U: gzip compressed Linux Kernel(TISDK-7.03.00)

Swapna yendrapalli

Intellectual 625 points

Part Number: DRA821U

Hi ,

We are trying to use gzip compressed kernel image from TISDK .

Looks like u-boot doesn't support gzip kernel decompression.

Booting using the fdt blob at 0x90ecf200
Uncompressing Kernel Image
gunzip error -5

Enabled gzip compression in u-boot configuration ( CONFIG_SPL_GZIP) uncompressing the kernel ok but when u-boot handles control to kernel saw synchronous abort with CPU reset

"Synchronous Abort" handler, esr 0x02000000
elr: 0000000000930000 lr : 00000000808025b4 (reloc)
elr: 0000000080008000 lr : 00000000ffeda5b4
x0 : 000000008e8cd000 x1 : 0000000000000000
x2 : 0000000000000000 x3 : 0000000000000000
x4 : 0000000080008000 x5 : 0000000000000001
x6 : 0000000000000008 x7 : 0000000000000000
x8 : 00000000fdead838 x9 : 0000000000000002
x10: 000000000a200023 x11: 0000000000000002
x12: 0000000000000002 x13: 000000000001869f
x14: 0000000000000000 x15: 00000000ffed9a58
x16: 00000000fff3b6f4 x17: 00000000fdecfe10
x18: 00000000fdeb7de8 x19: 00000000fffd29b0
x20: 00000000fffaa296 x21: 0000000000000000
x22: 0000000000000001 x23: 00000000fdecf7a8
x24: 00000000fdecf7a8 x25: 00000000fffb9da8
x26: 0000000000000000 x27: 00000000ffeda5f0
x28: 00000000900000d8 x29: 00000000fdead870Code: 5ef7d1fe 956d35fd 035d7d3f e6e4c4ad (464c457f)
Resetting CPU ...resetting ...

Please let me know if I missed any other settings?

Are other versions of compression(zImage) supported ?

Thanks,

Swapna

over 4 years ago

0 Keerthy J over 4 years ago

TI__Guru**** 164460 points

Hi Swapna,

Are you able to boot with the default Image that comes along with the SDK? Can you first try that if it is not tried
before trying the compressed versions?

Best Regards,
Keerthy

0 Swapna yendrapalli over 4 years ago in reply to Keerthy J

Intellectual 625 points

Thanks Keerthy!!

The uncompressed kernel "Image-j7200-evm.bin" from SDK works fine.

0 Keerthy J over 4 years ago in reply to Swapna yendrapalli

TI__Guru**** 164460 points

Hi Swapna,

J721e is ARM64 based. None of the arm64 architecture SoCs support zImage.

https://stackoverflow.com/questions/35691830/arm64-image-to-zimage-or-boot-img

For loading the .gz image what are the changes you made? Sorry this is not supported on our SDK.
So can you please share the changes you did and so that i can try to reproduce the issue?

Best Regards,
Keerthy

0 Swapna yendrapalli over 4 years ago in reply to Keerthy J

Intellectual 625 points

Hi Keerthy,

1) Enable gZip support in uboot (CONFIG_SPL_GZIP=y in j7200_evm_r5_defconfig)

2) Generate FIT image(j7200.itb) with kernel(vmlinux.gz-j7200-evm)+rootfs+dtb.

3) Stop at uboot prompt load the fit image

tftp 0x90000000 j7200.itb

4) Boot the FIT image

bootm 0x90000000

The above steps worked for the uncompressed Kernel image(Image) but does not seem to work for the compressed kernel(vmlinux.gz-j7200-evm)

Thanks,

Swapna

0 Keerthy J over 4 years ago in reply to Swapna yendrapalli

TI__Guru**** 164460 points

Hi Swapna,

Swapna yendrapalli said:
1) Enable gZip support in uboot (CONFIG_SPL_GZIP=y in j7200_evm_r5_defconfig)

This is not relevant for A72 u-boot.

Apologies again this is not something supported on SDK.

- Keerthy

0 Swapna yendrapalli over 4 years ago in reply to Keerthy J

Intellectual 625 points

Thanks Keerthy. Any plans to support compressed kernel images in future? For OSPI based boot devices this will be useful.

+1 Keerthy J over 4 years ago in reply to Swapna yendrapalli

TI__Guru**** 164460 points

No plans in the near future SDKs. If no further questions please click on verify answer.

- Keerthy

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DRA821U: gzip compressed Linux Kernel(TISDK-7.03.00)