[PATCH] Enable RaspberryPi arm64 to netboot a compressed kernel image

[Georg Gast]

This changes add
  - kernel_comp_addr_r=0x0800000
  - kernel_comp_size=0x0800000
to the default environment of the raspberry pi. With these two options
u-boot can uncompress a received compressed kernel and boot it.

I could just test these changes on raspberry pi 4B with 8GB of ram.

See the attached logs.

U-Boot 2021.10-dirty (Jan 08 2022 - 05:57:42 +0100)

DRAM:  7.9 GiB
RPI 4 Model B (0xd03114)
MMC:   mmc at 7e300000: 0, mmc at 7e340000: 1
Loading Environment from FAT... Card did not respond to voltage select! 
: -110
In:    serial
Out:   vidconsole
Err:   vidconsole
Net:   eth0: ethernet at 7d580000
PCIe BRCM: link up, 5.0 Gbps x1 (SSC)
starting USB...
Bus usb at 7e980000: USB DWC2
Bus xhci_pci: Register 5000420 NbrPorts 5
Starting the controller
USB XHCI 1.00
scanning bus usb at 7e980000 for devices... 1 USB Device(s) found
scanning bus xhci_pci for devices... Failed to get keyboard state from 
device 1997:2433
2 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot:  0
U-Boot> setenv boot_targets "dhcp pxe"
U-Boot> boot

georg at rpi64-test:~$ dmesg
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083]
[    0.000000] Linux version 5.15.10-rt24-v8 (georg at hammerhead) 
(aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU 
Binutils for Debian) 2.35.2) #1 SMP PREEMPT_RT Wed Jan 5 21:06:46 CET 2022
[    0.000000] Machine model: Raspberry Pi 4 Model B Rev 1.4
[    0.000000] efi: UEFI not found.
[    0.000000] Reserved memory: created CMA memory pool at 
0x0000000037400000, size 64 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible 
id shared-dma-pool
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000000000-0x000000003fffffff]
[    0.000000]   DMA32    [mem 0x0000000040000000-0x00000000ffffffff]
[    0.000000]   Normal   [mem 0x0000000100000000-0x00000001ffffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000003b3fffff]
[    0.000000]   node   0: [mem 0x0000000040000000-0x00000000fbffffff]
[    0.000000]   node   0: [mem 0x0000000100000000-0x00000001ffffffff]
[    0.000000] Initmem setup node 0 [mem 
0x0000000000000000-0x00000001ffffffff]
[    0.000000] percpu: Embedded 27 pages/cpu s73392 r8192 d29008 u110592
[    0.000000] pcpu-alloc: s73392 r8192 d29008 u110592 alloc=27*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[    0.000000] Detected PIPT I-cache on CPU0
[    0.000000] CPU features: detected: Spectre-v2
[    0.000000] CPU features: detected: Spectre-v4
[    0.000000] CPU features: detected: ARM errata 1165522, 1319367, or 
1530923
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 
2028848
[    0.000000] Kernel command line: rw console=ttyAMA0,115200u8 
console=tty1 earlyprintk root=/dev/nfs 
nfsroot=192.168.160.19:/srv/netboot/rpi64/rootfs 
ip=192.168.160.42:192.168.160.19:192.168.160.1::rpi64-test.schorsch-tech.de 
nfsrootdebug
[    0.000000] Unknown kernel command line parameters "earlyprintk 
nfsrootdebug", will be passed to user space.
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