If you remove any commands you don't actually need from CONFIG_COMMANDS you can strip you executable size down a fair bit. But if you need tftp support, you won't be able to get down to 32Kb.
Good luck Amnon
On 3/2/07, Laurent Pinchart laurent.pinchart@technotrade.biz wrote:
Hi Martin,
I would like to use U-Boot as a first-stage boot loader to program flash memory on the target board. The idea is to perform a two-steps procedure:
- Program the first-stage boot loader in flash using JTAG (slow)
There are JTAG programmers, which could work very fast (e. g. BDI2000 with workspace enabled). The limiting factor is the flash itself, not the programmer, or the JTAG interface.
- The first-stage boot loader downloads the final boot loader
(full-featured U-Boot) using TFTP and writes it to flash (fast)
To minimize time spent in step one, I need to make the first-stage boot loader as small as possible (hopefully less than 32kB). Has anyone ever stripped U-Boot that much ? Is there any documentation available ?
If programming speed is the only reason for your two-step approach, then IMO this is not reasonable. It would be a waste of your time. Use a faster JTAG programmer instead. Or you could buy the flashes preprogrammed.
Buying the flashes preprogrammed is not an option given the quantities.
We already have a BDI2000 which has issues programming the flash using the workspace, so it reverts to the slow pure JTAG mode. I still have to investigate this directly with Abatron, we haven't found a solution so far.
Even using the internal workspace, the BDI2000 is not a very practical solution, as it wouldn't be easy to integrate it in our test bench architecture. The price is also an issue. This is why I was looking for another solution. The alternative I thought of is using a pure JTAG programmer (slow) with a tiny ethernet-enabled boot loader. The Freescale JTAG commands used to control the processor are not documented, so I can't develop a faster JTAG-only alternative. Are you aware of any other solution ?
Laurent Pinchart
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