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ganboing / README
Last active May 5, 2025 09:23
P550 Trace Sample
msg.txt -> Nexus Message dump
trace.txt -> Nexus Trace dump
@ganboing
ganboing / eic7700_firmware.md
Last active March 4, 2025 02:59

EIC7700 firmware (bootchain)

First off, EIC7700 has several CPUs. MCPU (P550 cluster) + SCPU (E21) + LCPU (E21) + NPU and DSPs. The SCPU (Secure CPU) is used to run the Masked ROM after power on. The Masked ROM has the logic of loading different payloads from the selected boot source image and kickstarts other CPUs such as MCPU. Optionally it can also validate the cryptographic key/signature of the payload against OTP, thus implementing secure-boot. ESWIN calls the container of the payloads bootchain By default the boot source is QSPI boot flash. The bootchain is stored at the beginning of the flash (offset 0). The boot flash contains the following on my Hifive P550

  • DDR init: Vendor binary blob to initialize DDR (closed source)
  • "firmware": AFAIK, a very small piece of code that does little to nothing. Perhaps only to keep SCPU active.
  • bootloader: The usual opensbi+u-boot stuff that runs on MCPU. (open source, ESWIN maintains the patched opensbi/u-boot)

*As it's shown, the DDR init blob i

@ganboing
ganboing / n308.txt
Created October 3, 2024 06:35
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/applications/main.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/adma/adma_service.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/board.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/can/can_service.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/i2c/i2c_service.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/ir/ir_service.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/pm/k1x_pm.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/uart/board_uart.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/uart/ck_usart.c
/data/home/zhuxianbin/workspace/esos/esos/bsp/spacemit/drivers/uart/drv_usart.h
@ganboing
ganboing / jh7110_rom.md
Last active February 13, 2024 11:40
@ganboing
ganboing / jh7110_otp.md
Last active February 12, 2024 03:48
jh7110/vf2 OTP Dump
@ganboing
ganboing / gist:6f1a39dc64080ee3e0d953d789441c7c
Last active July 13, 2024 09:34
function FindProxyForURL(url, host)
{
ipv4 = /^\d+\.\d+\.\d+\.\d+$/;
if (ipv4.test(host) && isInNet(host, "192.168.0.0", "255.255.0.0") )
return "DIRECT"
return "SOCKS 192.168.0.10:1080";
}
@ganboing
ganboing / gist:a11aeddd746ecc27ac7958fc1534759d
Created November 28, 2020 03:50
function FindProxyForURL(url, host)
{
return "SOCKS 192.168.1.100:1080";
}
@ganboing
ganboing / gist:6c7645fdc47c57795a2e73edfef0b655
Last active May 12, 2020 07:59
function FindProxyForURL(url, host)
{
return "SOCKS 192.168.0.10:1082";
}
@ganboing
ganboing / gist:0d2576e4747c6e58e75612d17e0dc6cc
Created November 21, 2019 21:09
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