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rt-loader currently has two operation modes, piggy-backed and standalone. In standalone mode, the kernel load address is read from the uImage in flash. In piggy-backed mode, rt-loader instead uses its initial run address (aka run address during first run) as the kernel load address. This is safe and works fine for all devices either using U-boot or having no issue uploading an image to the default kernel load address 0x80100000. To extend usecases, allow to specify a kernel load address when building rt-loader. In this case, rt-loader uses this address instead of the address inferred at runtime. On certain Zyxel devices, this allows to upload and boot an rt-loader piggy-backed image to an alternate address but keep the default kernel load address of 0x80100000. BootExt on these devices occupies memory above and will crash during transfer when this address is used as upload location. Using this extension, the image can be uploaded to e.g. 0x80300000 and rt-loader will use 0x80100000 as the final load address. This avoid taking the pain the adjust the load address of the kernel itself. Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com> Link: https://github.com/openwrt/openwrt/pull/21248 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
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