c_meyer/pxt-ev3
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More info about how images are created

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This commit is contained in:
Michal Moskal
2017-07-26 18:57:46 +01:00
parent c6b4e506d1
commit 5e7754b436
4 changed files with 71 additions and 3 deletions
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26
brick/scripts/img.js
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@ -1,14 +1,34 @@
#!/bin/sh
let fs = require("fs")
let bootargs = "mem=${memsize} initrd=${filesysaddr},${filesyssize} root=/dev/ram0 rw rootfstype=cramfs console=${console} ip=${ipaddr} lpj=747520 quiet"
let bootnews = "mem=64M initrd=0xC1180000,10M root=/dev/ram0 rw rootfstype=cramfs console=${console} lpj=747520 quiet musb_hdrc.debug=2"
let piggy = true
function build() {
if (bootnews.length > bootargs.length) {
console.log("args too long")
return
}
while (bootnews.length < bootargs.length)
bootnews += " "
let cr = fs.readFileSync("cram.bin")
if (cr.length > 10878976) {
console.log("too big")
return
}
let img = fs.readFileSync("boot.bin")
let img = fs.readFileSync("EV3 Firmware V1.09D.bin")
for (let i = 0; i < bootnews.length; ++i) {
if (img[0x21DDA + i] != bootargs.charCodeAt(i)) {
console.log("boot args mismatch")
return
}
img[0x21DDA + i] = bootnews.charCodeAt(i)
}
let off = 0x250000
if (img[off] != 0x45 || img[off + 1] != 0x3d) {
console.log("bad magic: " + img[off] + " / " + img[off+1])
@ -17,8 +37,8 @@ function build() {
cr.copy(img, off)
let kern = fs.readFileSync("piggy-patched.gzip")
off = 0x0005540f
let kern = fs.readFileSync(piggy ? "piggy-patched.gzip" : "linux/arch/arm/boot/uImage")
off = piggy ? 0x0005540f : 0x00050000
if (img[off] != kern[0] || img[off+1] != kern[1]) {
console.log("bad kernel magic: " + img[off] + " / " + img[off+1])