Just updated the Dreamplug to 3.7-rc3, and the kernel compile is now without errors.. So, finally, the ERROR: “read_current_timer” problem has been fixed.. Fedora release 17 (Beefy Miracle) Kernel 3.7.0-rc3 on an armv5tel (ttyS0) ………………… $ uname -a Linux rgdreamplug 3.7.0-rc3 #1 Mon Oct 29 08:30:44 GMT 2012 armv5tel armv5tel armv5tel GNU/Linux … Continue reading →
I have managed to update the Dreamplug to kernel 3.7-rc1, after a simple fix, to get it to compile OK.. The original (cross)compile failed, with: ERROR: “read_current_timer” [drivers/video/udlfb.ko] undefined! ERROR: “read_current_timer” [crypto/tcrypt.ko] undefined! Fix, is to change ../linux-3.7-rc1/arch/arm/kernel/armksyms.c, at line 51, as follows: From: /* platform dependent support */ EXPORT_SYMBOL(arm_delay_ops); To: /* platform dependent support */ … Continue reading →
In a break from all the APC angst.. This is the test environment I have set up, for the (2) APCs and the Raspberry Pi. The Dreamplug is already connected separately via a separate JTAG/UART connector, and is headless, so doesn’t need the HDMI and monitor connections. Typically, a 3-way USB/HDMI KVM would be used, but these … Continue reading →
On the hunch that there may be something within the U-Boot parameters that causes the boot-to-ram problem, I removed almost all the ‘wmt.xxx‘ parameters. The only one remaining was wmt.usb.param=11:3, which enables the USB subsystem – as I was booting from a USB-attached ‘disk’.. You can effectively ‘remove’ U-Boot parameters by setting their values to <blank>: setenv … Continue reading →
As my APCs are being held to ransom, until I get an invoice for UK customs duty and taxes (by post!!) and am then able to pay it (online?).. I decided to add another flavour of cross-compiler to the ones I already have installed. This one comes from the self-contained OpenELEC environment which is used to create … Continue reading →
As the APCs are still ‘awaiting customs clearance’, I decided to try to cross-compile the kernel source available at github: https://github.com/apc-io/apc-8750 Unfortunately, many of the APC-specific drivers (‘wmt’) are currently missing.. The system is an Android 2.3 one, and the kernel is based – as you would expect – on Linux kernel version 2.6.32. (In this case … Continue reading →
Just received notification that the Android/ARM APCs have shipped from Taiwan.. So – they (just) managed to ship them in July! Now, all they have to do is run the gauntlet of UK Customs…
Updated the Dreamplug to kernel 3.4.5: rgdreamplug ~]$ uname -a Linux rgdreamplug 3.4.5 #1 Wed Jul 18 17:46:49 BST 2012 armv5tel armv5tel armv5tel GNU/Linux Tried 3.5-rc7, but that hung on boot, for some reason… More investigation needed.. … Continue reading →
Despite previous ‘tweaks’, I have been experiencing continuing problems with SD Card Linux performance, and with the unreliable operations of yum / rpm, with associated db corruption, when they have to be ‘killed’ after hanging.. Based on two excellent pieces of prior research: http://blogofterje.wordpress.com/2012/01/14/optimizing-fs-on-sd-card/ and http://www.raspberrypi.org/forum/projects-and-collaboration-general/optimizing-linux-for-flash-memory – I will be having a stimulating (!) time performing formatting … Continue reading →
Found the latest kernel image (still 3.1.9-based..) and associated pre-compiled modules at the git repository – https://github.com/raspberrypi/firmware – and the ‘new’ version of kernel.img does away with the annoying console debug messages.. Device still seems very slow, but maybe I’m too used to quad-core systems with masses of memory! I even tried the Debian system, as this … Continue reading →