Hi Rayees,
On Sat, 19 Oct 2019 at 20:14, Rayees Shamsuddin
<rayees.shamsud...@intusurg.com> wrote:
>
> Simon,
>
> Thanks for all your great and pioneering effort on verified u-boot. I am
> benefiting a lot for your work. I am trying to implement verified u-boot on
> Tegra TX2.
>
> Based on the wonderful documentation that you provided, I was able to
> successfully create a fit image and got the dtb and kernel to boot. But I ran
> into some issues when I incorporated ramdisk into the fit image. Initially,
> it would get stuck on “Starting kernel …”. Then I modified the environment as
> follows
> setenv initrd_high 8effffff
> setenv fdt_high 8effffff
>
> Initially it was set to
> fdt_high=ffffffffffffffff
> initrd_high=ffffffffffffffff
>
> I haven’t quite understood why this change caused the kernel to load. Is it
> because initrd_high=ffffffffffffffff overwrites the relocatable u-boot code?
>
> Anyway after this change, I got the kernel to boot, but with one caveat – the
> RAMDISK couldn’t be loaded.
>
> Booting using the fdt blob at 0x920989cc
> Loading Kernel Image ... OK
> reserving fdt memory region: addr=80000000 size=10000
> Loading Ramdisk to 8eab1000, end 8efffaa2 ... OK
> Loading Device Tree to 000000008ea5a000, end 000000008eab0fd2 ... OK
>
> Starting kernel ...
>
> [ 0.000000] Booting Linux on physical CPU 0x100
>
> However, I saw the message
> [ 5.403174] RAMDISK: Couldn't find valid RAM disk image starting at 0.
>
> I would be grateful if you could provide me some guidance on what might be
> causing this issue or how to go about resolving this.
Are you saying that it works correctly without verified boot?
Normally U-Boot should pass a pointer to the ramdisk to linux. That
should not change with vboot.
Regards,
Simon
>
> Thanks and Regards
> Rayees Shamsuddin
> Product Security Engineer
> Intuitive Surgical
>
> Tegra.its
>
> /dts-v1/;
> / {
> description = "fitImage for Tegra TX2";
> #address-cells = <1>;
> images {
> kernel@1 {
> description = "Linux kernel";
> data = /incbin/("Image");
> arch = "arm64";
> os = "linux";
> type = "kernel";
> compression = "none";
> load = <0x80280000>;
> entry = <0x80280000>;
> hash@1 {
> algo = "sha256";
> };
> };
> fdt@1 {
> description = "DTB for Tegra TX2";
> data = /incbin/("tegra186-quill-p3310-1000-c03-00-base.dtb");
> type = "flat_dt";
> arch = "arm64";
> compression = "none";
> hash@1 {
> algo = "sha256";
> };
> };
> ramdisk@1 {
> description = "Ramdisk Image for Tegra TX2";
> data = /incbin/("initrd");
> type = "ramdisk";
> arch = "arm64";
> os = "linux";
> compression = "gzip";
> load = <0x82a00000>;
> entry = <0x82a00000>;
> hash@1 {
> algo = "sha256";
> };
> };
> };
> configurations {
> default = "conf@1";
> conf@1 {
> description = "Boot Linux kernel, FDT blob and ramdisk";
> kernel = "kernel@1";
> fdt = "fdt@1";
> ramdisk = "ramdisk@1";
> signature@1 {
> algo = "sha256,rsa4096";
> key-name-hint = "tx2_key";
> sign-images = "fdt", "kernel", "ramdisk";
> };
> };
> };
> };
>
>
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