espressobin boot from UART

ESPRESSObin v7 boot from UART

如果版子上沒有bootloader(u-boot), 可使用UART mode 來recovery.

a. build UART images, they are located in build/a3700/debug/uart-images/ directory:

$ ls build/a3700/debug/uart-images
TIM_ATF.bin  atf-ntim.txt  boot-image_h.bin  wtmi_h.bin

b. 調jump to UART mode, 參考boot modes table

Boot modes - ESPRESSObin v7
ESPRESSObin boot mode	J11	J3	J10
Serial NOR flash download mode	2-3	2-3	1-2
eMMC download mode	2-3	1-2	2-3
eMMC alternate download mode	2-3	1-2	2-3
SATA download mode	2-3	1-2	2-3
Serial NAND flash download mode	2-3	1-2	2-3
UART mode	2-3	1-2	2-3
MicroSD card	2-3	1-2	2-3

 c.  open comport from windows and we should  should see the > prompt presented on the HyperTerminal screen. In this terminal, type wtp to switch the BootROM to WTP download mode.

 d.  download the WTPTP tools from extranet. 

 e. run this command from cmd.exe(-C 38 is your COM number)

>> WtpDownload.exe -P UART -C 38 -R 115200 -B path\to\TIM_ATF.bin -I path\to\wtmi_h.bin -I path\to\boot-image_h.bin -E

f. when you see the "Mavell>>" , use tftp to update bootloader
 set ip address

Marvell>> setenv serverip 192.168.x.x
Marvell>> setenv ipaddr 192.168.x.x

check

Marvell>> ping $serverip

update u-boot

Marvell>> bubt espressobin-bootloader-cpu-1000-ddr3-2cs-1g-atf-ga3306ab-uboot-gaee49fc-20180129-REL.bin
Burning U-BOOT image "espressobin-bootloader-cpu-1000-ddr3-2cs-1g-atf-ga3306ab-uboot-gaee49fc-20180129-REL.bin" from "tftp" to "spi"
Using neta@30000 device
TFTP from server 192.168.10.134; our IP address is 192.168.10.145
Filename 'espressobin-bootloader-cpu-1000-ddr3-2cs-1g-atf-ga3306ab-uboot-gaee49fc-20180129-REL.bin'.
Load address: 0x2000000
Loading: #################################################################
 #################################################################
 #################################################################
 #################################################################
 ##########################
 2.3 MiB/s
done
Bytes transferred = 4194304 (400000 hex)
Image checksum...OK!
SF: Detected w25q32dw with page size 256 Bytes, erase size 4 KiB, total 4 MiB
Erasing 4198400 bytes (1025 blocks) at offset 0 ...Done!
Writing 4194304 bytes from 0x2000000 to offset 0 ...Done!

g. chang jump to "Serial NOR flash download mode"