56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
#!/bin/sh
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let fs = require("fs")
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// we try to use shorter versions of all parameters for the additional parameters to fit
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let bootargs = "mem=${memsize} initrd=${filesysaddr},${filesyssize} root=/dev/ram0 rw rootfstype=cramfs console=${console} ip=${ipaddr} lpj=747520 quiet"
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let bootnews = "mem=64M initrd=0xC1180000,10M root=1:0 rw rootfstype=cramfs console=${console} lpj=747520 musb_hdrc.use_dma=0 log_buf_len=128k quiet"
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let piggy = true
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function build() {
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if (bootnews.length > bootargs.length) {
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console.log("args too long")
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return
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}
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while (bootnews.length < bootargs.length)
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bootnews += " "
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let cr = fs.readFileSync("cram.bin")
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if (cr.length > 10485760) {
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console.log("too big by " + (cr.length - 10485760))
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return
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}
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let img = fs.readFileSync("EV3 Firmware V1.09D.bin")
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for (let i = 0; i < bootnews.length; ++i) {
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if (img[0x21DDA + i] != bootargs.charCodeAt(i)) {
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console.log("boot args mismatch")
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return
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}
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img[0x21DDA + i] = bootnews.charCodeAt(i)
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}
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let off = 0x250000
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if (img[off] != 0x45 || img[off + 1] != 0x3d) {
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console.log("bad magic: " + img[off] + " / " + img[off+1])
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return
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}
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cr.copy(img, off)
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let kern = fs.readFileSync(piggy ? "piggy-patched.gzip" : "linux/arch/arm/boot/uImage")
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off = piggy ? 0x0005540f : 0x00050000
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if (img[off] != kern[0] || img[off+1] != kern[1]) {
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console.log("bad kernel magic: " + img[off] + " / " + img[off+1])
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return
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}
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kern.copy(img, off)
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fs.writeFileSync("firmware.bin", img)
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}
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build()
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