Migrate to U-Boot

Variants of migration

---

1. Sosuboot-tegra
   1. With prebuilt sosuboot-tegra binary (require PC)
   2. With prebuilt sosuboot-tegra archive or sdcard image (PC not required)
   3. With self-compiled sosuboot-tegra
2. Manual
   1. With PC
   2. Without PC

With prebuilt sosuboot-tegra binary (require PC)

---

Requirements

• Download sosuboot-tegra binary to PC from here: https://drive.google.com/drive/folders/0BzHUnWusu2zteXYydWo1Q3RGR3c?usp=sharing

• Install tegrarcm to PC with compilation from sources: https://github.com/NVIDIA/tegrarcm

$ git clone https://github.com/NVIDIA/tegrarcm.git
$ cd tegrarcm
$ ./autogen.sh
$ ./configure
$ make
$ make install

• Install tegrarcm binary for openSUSE PC: https://build.opensuse.org/package/show/hardware/tegrarcm

# zypper ar -f http://download.opensuse.org/repositories/hardware/openSUSE_Leap_42.2/ Hardware
# zypper in tegrarcm

• Connect AC100 miniUSB port to PC

• Enter RCM aka APX mode on AC100
  • Press CTRL+ESC+Power button

Syslog on PC which shows that RCM/APX mode started

[12060.106270] usb 1-1.2.5.2: new high-speed USB device number 15 using ehci-pci
[12060.200163] usb 1-1.2.5.2: New USB device found, idVendor=0955, idProduct=7820
[12060.200170] usb 1-1.2.5.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[12060.200173] usb 1-1.2.5.2: Product: APX
[12060.200175] usb 1-1.2.5.2: Manufacturer: NVIDIA Corp.

Load sosuboot-tegra

• Read current bct from AC100 with tegrarcm

# tegrarcm readbct --bct=ac100.bct

• Load sosuboot-tegra into AC100 RAM

# tegrarcm --bct=ac100.bct --bootloader=sos-uboot-2017.02-git-00562-g60ea164.bin --loadaddr=0x108000

PC Output:

bct file: ac100.bct
booloader file: sos-uboot-2017.02-git-00562-g60ea164.bin
load addr 0x108000
entry addr 0x108000
device id: 0x7820
Chip UID:                0x0000000000000000161c10c742e09257
Chip ID:                 0x20
Chip ID Major Version:   0x1
Chip ID Minor Version:   0x2
Chip SKU:                0x8 (t20)
Boot ROM Version:        0x1
Boot Device:             0x2 (EMMC)
Operating Mode:          0x3 (developer mode)
Device Config Strap:     0x1
Device Config Fuse:      0x0
SDRAM Config Strap:      0x0
sending file: ac100.bct
- 4080/4080 bytes sent
ac100.bct sent successfully
sending file: sos-uboot-2017.02-git-00562-g60ea164.bin
- 33587434/33587434 bytes sent
sos-uboot-2017.02-git-00562-g60ea164.bin sent successfully

AC100 will boot into Linux.

Replace factory bootloader with U-Boot

• Write U-Boot bootloader binary bundled with sosuboot-tegra into AC100 eMMC

# cd /boot
# getbct.sh
# mkbct.sh
# uploadbct.sh

U-Boot written to eMMC you can reboot AC100 now.

---

---

---

---