UBoot maximum TFTP transfer size?

Installing and Using OpenWrt
1

Technically not an OpenWrt question, but I was trying to revive an old RT5350 board and it did only accept an image less than 4MB in size over uboot tftp.

I am willing to update the uboot to accept 8MB (which is the flash size), but I can’t find where the 4MB is (hard?) coded into uboot.

Anyone who can point me in the right direction?

Work around now: flash in old OpenWrt image and do a sysupgrade after. Not ideal for development when I “F” it up.

2

I don't think there is an arbitrary such hard limit anywhere. Most likely it is rather a clash in addresses where you are trying to load it into in RAM. What exactly is the output you are getting when it fails?

1 Like
3 
*** init button is pressed

 NetTxPacket = 0x81FE62C0 

 KSEG1ADDR(NetTxPacket) = 0xA1FE62C0 

 NetLoop,call eth_halt ! 
Trying Eth0 (10/100-M)

 Waitting for RX_DMA_BUSY status Start... done


 Header Payload scatter function is Disable !! 

 ETH_STATE_ACTIVE!! 
TFTP server is available now.
Got ARP REQUEST, return our IP
start to receive image...
   Verifying Checksum ... OK
Image size is too large!

TFTP: Checksum error

If I use an image less than 4MB it works just fine.

start to receive image...
   Verifying Checksum ... OK


*** Upgrade system code. ***

imgSize = 3932342 bytes (0x003C00B6).
start to erase sectors & write image...
..................................

continues flashing then reboots as expected. Boot log shows correct Flash

U-Boot 1.1.3 (Aug 16 2013 - 11:43:02)

Board: Ralink APSoC DRAM:  32 MB
relocate_code Pointer at: 81fc0000
spi_wait_nsec: 42 
spi device id: c2 20 17 c2 20 (2017c220)
find flash: MX25L6405D
ip addr = 0x6401A8C0 
.mac addr = 00:01:02:03:04:05

[    0.656697] spi spi0.0: force spi mode3
[    0.665959] m25p80 spi0.0: mx25l6405d (8192 Kbytes)
[    0.675896] 4 fixed-partitions partitions found on MTD device spi0.0
[    0.688634] Creating 4 MTD partitions on "spi0.0":
[    0.698248] 0x000000000000-0x000000030000 : "u-boot"
[    0.710066] 0x000000030000-0x000000040000 : "u-boot-env"
[    0.722634] 0x000000040000-0x000000050000 : "factory"
[    0.734630] 0x000000050000-0x000000800000 : "firmware"
[    1.646263] 2 uimage-fw partitions found on MTD device firmware
[    1.658212] 0x000000050000-0x0000001a27fa : "kernel"
[    1.669893] 0x0000001a27fa-0x000000800000 : "rootfs"
[    1.681833] mtd: device 5 (rootfs) set to be root filesystem
[    1.697331] 1 squashfs-split partitions found on MTD device rootfs
[    1.709820] 0x0000003d9000-0x000000800000 : "rootfs_data"