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Re: TS7200_INSTALL kernel problem solved - kernel too big!
In message: <494192D2.3050505%embeddedARM.com@localhost>
Jesse Off <joff%embeddedARM.com@localhost> writes:
: Ken Hornstein wrote:
: >> u-boot has those features now, but not redboot.
: > Yeah, I think that unless Embedded ARM wants to switch to u-boot, that
: > help us. Ah, well.
: > --Ken
: We're not a big fan of either u-Boot or RedBoot out here. Seems like
: overkill to write one OS to for the sole purpose of starting up
: another. I personally prefer to minimize how many drivers I write or
: debug for the same hardware. :-)
: In our new products, we have written a 442 byte bootloader that loads
: kernels from x86 MBR style partitions of either NAND flash or SD card
: and can boot a small Linux kernel + ramdisk in about the same amount of
: time it takes the RedBoot or u-boot bloatware to start up. Once up, we
: have written a Linux program + kernel module that can start up other
: OS's, RTOS's, and OS-less applications. In effect, we use Linux as our
: bootloader so that you could load kernels via NFS over USB wifi dongle
: and configure pre-bootup behavior in shell script, etc...
442! Wow! I was all proud of a 9k boot loader I wrote for the
AT91RM9200 that I was working that loaded kernels off a ufs partition,
including a SD/MMC card isolation and reading stack and keyboard
interrupt/kernel name entry... I stopped at 9k since that easily fit
in the 12k+4k stack that you have in the initial program load on that
SoC. I was bummed to see that newer at91 parts had only 4k of RAM for
the initial load, which was going to be a big stretch.... but I
: Here's some info on it:
: I ported the bootload utility to NetBSD too-- it doesn't even need a
: kernel module. I do what I need to do there via /dev/mem and /dev/kmem.
: This application + kernel module should also work on the default TS-7200
: Linux installation. You can place the NetBSD kernel on the Linux JFFS2
: filesystem and then run our "bootload" command to soft-boot into another
: OS. On the platforms we've standardized on this scheme we can go from
: power-on to Linux to another OS in about 3 seconds or so. The TS-7200
: Linux boots up a little slower, but its still not too bad.
Well, at least I got this same speed: power on to mounting a FreeBSD
root was between 2s and 3s...
Very cool that you can do similar in so much less...
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