Hi Alexander,
On Sun, Mar 26, 2017 at 04:13:47PM +0200, Alexander Kurz wrote:
> The Kindle Model No. D01100 (Kindle Wi-Fi), D01200 (Kindle Touch)
> and EY21 (Kindle Paperwhite) are refered as the Kindle 4th and 5th generation.
> Those models are based on an i.MX50 SoC and use LPDDR1 or LPDDR2 Memory.
>
> The devices boot in internal boot mode from a build-in eMMC, alternatively
> some devices may be set into USB-downloader mode by pressing a specific key
> at startup.
>
> Add support for the i.MX50 based Kindle device and make barebox a drop-in
> replacement for the factory shipped u-boot image.
>
> Notable features:
> - Support for eMMC, USB, UART, I2C, SPI and Keys (except keyboard).
> - LPDDR1 and LPDDR2 setup is done via DCD, the same imximage may be used
> for USB-startup and for installation.
> - Support for vendor specific ATAGs that are required for the Kindle-System.
> - usbserial barebox console access by pressing Select button at startup,
> alternatively full console support on connector J14.
>
> +/* 16 byte id for serial number */
> +#define ATAG_SERIAL16 0x5441000a
> +/* 16 byte id for a board revision */
> +#define ATAG_REVISION16 0x5441000b
> +
> +struct char16_tag {
> + char data[16];
> +};
> +
> +static struct tag *setup_16char_tag(struct tag *params, uint32_t tag,
> + const char *value)
> +{
> + struct char16_tag *target;
> + target = ((void *) params) + sizeof(struct tag_header);
> + params->hdr.tag = tag;
> + params->hdr.size = tag_size(char16_tag);
> + memcpy(target->data, value, sizeof target->data);
> + return tag_next(params);
> +}
> +
> +static const char *get_env_16char_tag(const char *tag)
> +{
> + static const char *default16 = "0000000000000000";
> + const char *value;
> + value = getenv(tag);
> + if (!value) {
> + printf("env var %s not found, using default\n", tag);
> + return default16;
> + }
> + if (strlen(value) != 16) {
> + printf("env var %s: expecting 16 characters, using default\n",
> + tag);
> + return default16;
> + }
> + printf("%s: %s\n", tag, value);
> + return value;
> +}
> +
> +BAREBOX_MAGICVAR_NAMED(global_atags_serial16, global.board.serial16,
> + "Pass the kindle Serial as vendor-specific ATAG to linux");
> +BAREBOX_MAGICVAR_NAMED(global_atags_revision16, global.board.revision16,
> + "Pass the kindle BoardId as vendor-specific ATAG to linux");
Would something like the following work to get the serial/revision
variables?
static char *serial16;
static char *revision16;
static char *mac;
static int kindle_rev_init(void)
{
int ret;
size_t size;
void *buf;
ret = read_file_2("/dev/disk0.boot0.userdata", &size, &buf, 128);
serial16 = xzalloc(17);
revision16 = xzalloc(17);
mac = xzalloc(17);
if (!ret) {
memcpy(serial16, buf, 16);
memcpy(revision16, buf + 96, 16);
memcpy(mac, buf + 48, 16);
}
globalvar_add_simple_string("board.serial16", &serial16);
globalvar_add_simple_string("board.revision16", &revision16);
globalvar_add_simple_string("board.mac", &mac);
free(buf);
}
> +mci0.probe=1
> +addpart /dev/disk0.boot0 0x800@0x400(imx_header),0x3e000@0x1000(self),0x1400@0x3f000(userdata)
> +addpart /dev/disk0 0xe00000@0x41000(kernel),0xe00000@0xe41000(diags_kernel)
You would have to move this partitioning to device tree though.
Sascha
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