I have acquired a Sheevaplug and I just tried installed the latest uboot 2016.05-tld-1. I then tried to boot an SD with the Debian root file system from the Debian section of this forum. It appears that the Sheevaplug version of uboot is missing at least the mmc and load commands. See the following log from attempting to boot the SD card after successful install of uboot and the uboot.2016.05-tld-1 environment files. I did add some other uboot environment variable to allow me to boot from nand, but the commands which should allow booting from SD have not been modified.
As you can see from the ouput of help above there is no "mmc" command or any "load" command which causes issues with the scan_disk run command. I believe this will also cause issues with booting from USB, but I could modify scandisk to use ext4load instead of load to allow boot from USB. However I don't see any way to boot from SD with this uboot version.
Ray
U-Boot 2016.05-tld-1 (Jun 12 2016 - 14:02:47 -0700) Marvell-Sheevaplug SoC: Kirkwood 88F6281_A0 DRAM: 512 MiB WARNING: Caches not enabled NAND: 512 MiB In: serial Out: serial Err: serial Net: egiga0 88E1116 Initialized on egiga0 Hit any key to stop autoboot: 0 starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device 2 USB Device(s) found scanning usb for storage devices... Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Use USB retry period from the environment: 15 second(s) Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device 1 Storage Device(s) found Unknown command 'ide' - try 'help' Unknown command 'mmc' - try 'help' Partition Map for USB device 0 -- Partition Type: DOS Part Start Sector Num Sectors UUID Type Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device Error: Cannot find high speed parent of usb-1 device 1 2048 29184 972187e0-01 0b loading envs from usb 0 ... Unknown command 'load' - try 'help' Unknown command 'ide' - try 'help' Unknown command 'mmc' - try 'help' running scan_disk ... Scan device usb device usb 0:1 Unknown command 'load' - try 'help' device usb 1:1 Unknown command 'load' - try 'help' device usb 2:1 Unknown command 'load' - try 'help' device usb 3:1 Unknown command 'load' - try 'help' Scan device ide Unknown command 'ide' - try 'help' device ide 0:1 Unknown command 'load' - try 'help' device ide 1:1 Unknown command 'load' - try 'help' device ide 2:1 Unknown command 'load' - try 'help' device ide 3:1 Unknown command 'load' - try 'help' Scan device mmc Unknown command 'mmc' - try 'help' device mmc 0:1 Unknown command 'load' - try 'help' device mmc 1:1 Unknown command 'load' - try 'help' device mmc 2:1 Unknown command 'load' - try 'help' device mmc 3:1 Unknown command 'load' - try 'help' loading uImage ... Unknown command 'load' - try 'help' loading uInitrd ... Unknown command 'load' - try 'help' loading DTB /boot/dts/kirkwood-pogo_e02.dtb ... Unknown command 'load' - try 'help' Wrong Image Format for bootm command ERROR: can't get kernel image! Sheevaplug> help ? - alias for 'help' base - print or set address offset bdinfo - print Board Info structure boot - boot default, i.e., run 'bootcmd' bootd - boot default, i.e., run 'bootcmd' bootefi - Boots an EFI payload from memory bootelf - Boot from an ELF image in memory bootm - boot application image from memory bootp - boot image via network using BOOTP/TFTP protocol bootvx - Boot vxWorks from an ELF image bootz - boot Linux zImage image from memory chpart - change active partition cmp - memory compare coninfo - print console devices and information cp - memory copy crc32 - checksum calculation date - get/set/reset date & time dhcp - boot image via network using DHCP/TFTP protocol dns - lookup the IP of a hostname echo - echo args to console editenv - edit environment variable env - environment handling commands exit - exit script ext2load- load binary file from a Ext2 filesystem ext2ls - list files in a directory (default /) ext4load- load binary file from a Ext4 filesystem ext4ls - list files in a directory (default /) ext4size- determine a file's size false - do nothing, unsuccessfully fatinfo - print information about filesystem fatload - load binary file from a dos filesystem fatls - list files in a directory (default /) fatsize - determine a file's size fdt - flattened device tree utility commands fsinfo - print information about jffs filesystems fsload - load binary file from a jffs filesystem image fsls - list jffs files in a directory (default /) go - start application at address 'addr' gpio - query and control gpio pins help - print command description/usage iminfo - print header information for application image imxtract- extract a part of a multi-image itest - return true/false on integer compare loadb - load binary file over serial line (kermit mode) loads - load S-Record file over serial line loadx - load binary file over serial line (xmodem mode) loady - load binary file over serial line (ymodem mode) loop - infinite loop on address range md - memory display mii - MII utility commands mm - memory modify (auto-incrementing address) mtdparts- define flash/nand partitions mw - memory write (fill) nand - NAND sub-system nboot - boot from NAND device nfs - boot image via network using NFS protocol nm - memory modify (constant address) ping - send ICMP ECHO_REQUEST to network host printenv- print environment variables reset - Perform RESET of the CPU run - run commands in an environment variable saveenv - save environment variables to persistent storage setenv - set environment variables setexpr - set environment variable as the result of eval expression showvar - print local hushshell variables sleep - delay execution for some time sntp - synchronize RTC via network source - run script from memory test - minimal test like /bin/sh tftpboot- boot image via network using TFTP protocol true - do nothing, successfully ubi - ubi commands ubifsload- load file from an UBIFS filesystem ubifsls - list files in a directory ubifsmount- mount UBIFS volume ubifsumount- unmount UBIFS volume usb - USB sub-system usbboot - boot from USB device version - print monitor, compiler and linker version Sheevaplug> printenv arcNumber=2097 bootargs=console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 mtdparts=orion_nand:1M(u-boot),4M(uImage),32M(rootfs),-(data) bootargs_nand=rootfstype=jffs2 console=ttyS0,115200 mtdparts=orion_nand:0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs) rw root=/dev/mtdblock1 rw ip=10.4.50.4:10.4.50.5:10.4.50.5:255.255.255.0:DB88FXX81:eth0:none bootcmd=run bootcmd_uenv; run scan_disk; run set_bootargs; run bootcmd_exec bootcmd_exec=run load_uimage; if run load_initrd; then if run load_dtb; then bootm $load_uimage_addr $load_initrd_addr $load_dtb_addr; else bootm $load_uimage_addr $load_initrd_addr; fi; else if run load_dtb; then bootm $load_uimage_addr - $load_dtb_addr; else bootm $load_uimage_addr; fi; fi bootcmd_nand=nand read.e 0x800000 0x100000 0x400000; bootm 0x800000 bootcmd_uenv=run uenv_load; if test $uenv_loaded -eq 1; then run uenv_import; fi bootdelay=10 bootdev=usb device=0:1 devices=usb ide mmc disks=0 1 2 3 dtb_file=/boot/dts/kirkwood-pogo_e02.dtb ethact=egiga0 ethaddr=00:50:43:01:44:F0 if_netconsole=ping $serverip init_ide=ide reset init_mmc=mmc rescan init_usb=usb start ipaddr=192.168.0.231 led_error=orange blinking led_exit=green off led_init=green blinking load_dtb=echo loading DTB $dtb_file ...; load $bootdev $device $load_dtb_addr $dtb_file load_dtb_addr=0x1c00000 load_initrd=echo loading uInitrd ...; load $bootdev $device $load_initrd_addr /boot/uInitrd load_initrd_addr=0x1100000 load_uimage=echo loading uImage ...; load $bootdev $device $load_uimage_addr /boot/uImage load_uimage_addr=0x800000 mainlineLinux=yes mtdids=nand0=orion_nand mtdparts=mtdparts=orion_nand:1M(u-boot),4M(uImage),32M(rootfs),-(data) partition=nand0,2 preboot_nc=run if_netconsole start_netconsole setenv scan_ide "ide reset"; setenv scan_mmc "mmc rescan"; for dev in $devices; do if test $scan_done -eq 0; then echo Scan device $dev; run scan_$dev; for disknum in $disks; do if test $scan_done -eq 0; then echo device $dev $disknum:1; if load $dev $disknum:1 $load_uimage_addr /boot/uImage 1; then scan_done=1; echo Found bootable drive on $dev $disknum; setenv device $disknum:1; setenv bootdev $dev; fi; fi; done; fi; done scan_ide=ide reset scan_mmc=mmc rescan scan_usb=usb start serverip=192.168.0.220 set_bootargs=setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 $mtdparts $custom_params set_bootargs_nand=setenv bootargs $bootargs_nand start_netconsole=setenv ncip $serverip; setenv bootdelay 10; setenv stdin nc; setenv stdout nc; setenv stderr nc; version; stderr=serial stdin=serial stdout=serial uenv_addr=0x81 0000 uenv_import=echo importing envs ...; env import -t $uenv_addr $filesize uenv_init_devices=setenv init_usb "usb start"; setenv init_ide "ide reset"; setenv init_mmc "mmc rescan"; for devtype in $devices; do run init_$devtype; done; uenv_load=run uenv_init_devices; setenv uenv_loaded 0; for devtype in $devices; do for disknum in 0; do run uenv_read_disk; done; done; uenv_loaded=0 uenv_read=echo loading envs from $devtype $disknum ...; if load $devtype $disknum:1 $uenv_addr /boot/uEnv.txt; then setenv uenv_loaded 1; fi uenv_read_disk=if test $devtype -eq mmc; then if $devtype part; then run uenv_read; fi; else if $devtype part $disknum; then run uenv_read; fi; fi usb_ready_retry=15 Environment size: 3456/131068 bytes Sheevaplug>
As you can see from the ouput of help above there is no "mmc" command or any "load" command which causes issues with the scan_disk run command. I believe this will also cause issues with booting from USB, but I could modify scandisk to use ext4load instead of load to allow boot from USB. However I don't see any way to boot from SD with this uboot version.
Ray